Margin of Error

by Rachel Lacey

From Rachel Lacey, author of Learning Curves, comes a tender, hopeful romance about how fate is what you’re given but love is what you choose, and how small sparks can change everything.

Two years after an accident in Manhattan almost claimed her life, Marin is determined to take advantage of her second chance. She’s left her husband, her job, even her home to pursue the life she’s always wanted. Now she’s teaching statistics at Northshire University and preparing to do something she’s spent decades dreaming date a woman. But the last woman she expects to encounter on her journey is the one she’s been fantasizing about since their chance encounter the morning Marin nearly died.

Charlotte has made big changes in her life since that fateful day too. Most importantly, she’s moved back to her Vermont hometown, determined to finally solve the thirty-year-old mystery of her mother’s disappearance. An unexpected—and unexpectedly intense—friendship? That wasn’t in the plan. Neither was questioning her sexuality, but the more time Charlotte spends with Marin, the more she realizes her feelings run deeper than friendship.

Surely this would be a disaster, both of them being each other’s first, except the chemistry between them feels too strong to deny. But as they get to the heart of the mystery—and the heart of who they are—what brought them together just might tear them apart.

Genres: Romance, Lesbian, Queer, LGBT, Contemporary, Adult, Friends To Lovers

314 pages, Kindle Edition

Expected publication February 3, 2026

About the author

Rachel Lacey is an award-winning contemporary romance author and semi-reformed travel junkie. She's been climbed by a monkey on a mountain in Japan, gone scuba diving on the Great Barrier Reef, and camped out overnight in New York City for a chance to be an extra in a movie. These days, the majority of her adventures take place on the pages of the books she writes. She lives in the mountains of Vermont with her family and a variety of rescue pets.

Reviews

[milena · Rating 5 out of 5]

⭐️⭐️⭐️⭐️⭐️
I am convinced that Rachel Lacey only writes masterpieces.

Firstly, I loved how characters from her other books were briefly mentioned. It makes me feel like I'm diving into a little world that I never want to leave!

As I said, Rachel Lacey is my absolute favorite author, and with this book she has shown me once again why. No other author can make me feel the same emotions as her books do!

I really liked the plot of the story. Novels where older women discover their sexuality are so desperately needed, and I think Rachel Lacey has done an excellent job of representing this! The book had a perfect balance of action and sweet moments.

Thanks to NetGalley and Rachel Lacey for providing me with an arc! <3 I left this review voluntarily.

[SJARR ✨ · Rating 5 out of 5]

The cure to my reading slump? It’s been a little while since I was this locked in to a book this hard. I pretty much knew from page one that this was going to be my next 5-star read.

* Full RTC closer to official publication date!

[Clara Addicted to sapphic books · Rating 4 out of 5]

I loved the prologue scene, without knowing it, Charlotte and Marin are linked for life in a scary and strong scene. The fate factor played a strong part in their story, to put them on the same path again. I like when authors don’t torture me for chapters for the characters to interact with each other. The friendship they develop was really sweet to read and I love how Charlotte cames to terms with her, the jealousy, the self talk. Marin is really likeable too, and I know a lot of women coming out late in life will recognize themselves in her. I really felt the nerves and the exiliration to finally live her truth. The story around Charlotte’s mother added some mystery, but I expected something deeper. I wasn’t a fan of the fight in the end that felt a bit unecessary to me. Lacey’s book are always plaisant and easy to read.

[Marta · Rating 4 out of 5]

7/10: 3.5⭐️’s rounded up to 4⭐️’s

Do you believe in fate?

Charlotte: Always searching, always drifting (aka running?)
Marin: Always go with the flow and do what’s expected of her.

They meet on a bus and strike up a short, but meaningful conversation to the both of them. Marin gets off the bus and is hit by a car. Charlotte rushes to her and holds her hand as she lay on the cold snowy ground dying while waiting for the ambulance. She sees the paramedic shake their head as the ambulance doors close.

Skip ahead two years and much to Charlottes surprise, her new real estate client is non other than the woman who hand she held as she died. Except that she apparently didn’t die! That moment 2 years ago had such a profound effect on Charlottes life. She is thrilled to find out that this woman, whom she felt immediately drawn to that day on the bus is alive.
Marin, is also surprised and happy to see that Charlotte is her realtor. She has thought about the kind woman who held her hand that awful day that altered the course of her life.
The two form a quick friendship. The connection they both felt on the bus is still very much there. But is there more to it than just friendship? Is there a growing attraction between the two women?

What first drew me to this book was that the word mystery was in the description and house hunting. I don’t read many (okay it’s been years) romance centered books anymore and have been wanting to slowly dip a toe back into the genre. I remembered liking books by this author years ago and decided to give this book a try.

It was a cute story two women’s journey in finding themselves. Finding their authentic self. I am often envious of small children because they seem so purely authentic. When does that change? And why is it so hard to be our true selves? I suppose for some people, they don’t know their true selves so it does become a journey to find that. For others, they may know, but are afraid to let others know. As for the rest, I am fresh out of ideas! It could be so many things that factor in. Lucky are those who are their true authentic selves.

Both women are experiencing changes in their lives when they meet again. Charlotte has decided to dig into search for her mom who went missing 30 years ago and work on getting to know her dad again.
Marin is newly divorced, recovering from her injuries and deciding that she needs to finally live for herself. She begins a new career and adopts an ADORABLE puppy, Ember. Bless that puppy’s heart. I think I need a dog friend. Is that weird? Is that a thing? Can I just borrow a friends dog for bits of time. Kind of rude to ask the friend to stay at home though, I suppose! 😂. I don’t know that I would be a good pet owner, that seems like a lot of pressure and work, but a dog friend to keep me company sometimes? I might like that. Of course it has to be a dog that I am not scared of! (Side note: I never had pets growing up due to a sister with severe animal fur allergies. And I also recently learned of an event that happened with a dog when I was apparently too young to remember it. I always had a specific incident in mind as to why I am afraid of most dogs, not all, but most, but there was an incident well before that too.) Anyways, back to Marin; She has also decided to ‘come out’ to her siblings.

I enjoyed this book. I have never read a f/f romance novel. I liked the day to day of their lives unfolding in front of me. How their friendship and connection evolved. And for those of you who like a steamy, tension filled, build up to romance…..there is definitely some of that in here!! Had I been reading this while other people were around, I would have maybe needed to stop for fear of possible blushing😂. It’s been a long time since I read a book with so much sexual tension in it!

I also need to mention that I loved how the main characters were 40 and 47. When I used to read romance books the mc’s were usually much younger. And now that I am in my early 40’s I really appreciate having a romance feature people closer to my own age. It was refreshing in a way.

Fate brought them back together. But can it keep them together?

I wasn’t a huge fan of the ending. I don’t think it was necessary to throw some of that back in, I think it took away from an earlier moment that would have maybe been more impactful without that extra bit. But that could just be me.

Overall a good book to get back into the romance genre!

Many thanks to NetGalley and Montlake publishing for this early digital arc of this book. All thoughts are my own.

Expected publication date February 3, 2026.

Rating and review and slight dog rambling posted: 10/4/25
Posted to Goodreads: 1/17/26, still a few days earlier than the publishers requested two weeks before publication, but i am thinking of it now soooo......

[lexie · Rating 3 out of 5]

the highs were high but the lows were abysmally low…

thank you to netgalley and montlake for the arc

[Andrea (looseleftlesbian) · Rating 5 out of 5]

4.5 ⭐️Thank you Rachel Lacey and NetGalley for the ARC! I am not sure why I am surprised that I loved this from the very beginning. I remember looking down at how far I was into the book and I was only 9% through when I literally said out loud, “This is so good.” I loved that Michelle and Audrey made appearances and I loved that Eden Sands was mentioned from Rachel’s other books!

Both MCs are over 40(40 and 47). I thought I might have an issue with relating to them due to this, but that wasn’t an issue at all. The way that Rachel writes her characters makes it so easy to relate to. They are always complex, dimensional characters and Margin of Error is no exception. Exploring the complexities of coming out later in life was realistic and I believe will help a lot of people. The fears, hopes, emotions of these two women were so visceral and well written, that you could feel it coming off the page

I can’t really say the way they met was a meet cute, seeing that Marin almost died right after, but it was unique the way they met and it tied up nicely with the plot and the ending. I was so interested in the missing mom portion of the story. Once again, a unique storyline that kept my attention. Yeah, this is a love story, but it’s so much more!

[clara ☆ · Rating 4 out of 5]

➥ 4 stars ⋆˚࿔

I can’t believe the academia duology is over now🥲🥲 I loved every single second of it and I’ll miss Marin, Charlotte, Audrey, and Michelle a whole lot. Rtc!

Thank you to Rachel Lacey, Montlake and NetGalley for the ARC! This review was left voluntarily.

[Leyla · Rating 3 out of 5]

Love me a story with adult sapphics!! Both MCs are in their 40s and busy with their grown up lives and I enjoy that!

The start of this is so good, I was really hooked on this seemingly fated connection between Marin and Charlotte and really hyped to see their story unfold.

I like them and I liked the writing, but I don’t like the finding charlottes mom plot very much, especially in the middle part of the book where I felt like we should’ve been focusing on charlottes journey with her identity and Marins coming out and dating process.. it was just an unwelcome distraction tbh😅😅

Other than that I really enjoyed reading it and give it a solid 3.5✨



I’ve received an ARC through NetGalley but all opinions are my own!

[Lucy Bexley · Rating 5 out of 5]

Rachel Lacey is doing some kind of sorcery because I absolutely fly through her books. I don’t want to say too much before this one is out but the plot is rich beyond the romance storyline and I absolutely loved the two MCs discovering things together—I haven’t seen that done before (not that it hasn’t , just not in a book I’ve read). Also, hooray for older heroines!

[BooksWithSuun · Rating 4 out of 5]

Just finished reading *Margin of Error* by Rachel Lacey (huge thanks to Rachel and NetGalley for the ARC!). The story follows both Charlotte and Marin as they discover their sexuality, which felt really authentic and made me think of my own coming-out journey. The nervousness, curiosity, and tenderness they experience came across as real and relatable.

Alongside that, there’s a gripping mystery about Charlotte trying to uncover what happened to her mom. Both storylines are emotional and well-written, with a satisfying ending to the mystery.

The writing is very detailed, which I usually enjoy, but here it sometimes slowed the pace and interrupted the flow. The style isn’t my absolute favorite but definitely enjoyable.

The start felt a little slow, but once the “gay panic” moments kicked in, things got way more interesting. I liked the couple, but their chemistry didn’t totally sweep me off my feet. Their love story was still sweet and cute enough to keep me hooked.

All in all, *Margin of Error* is an emotional, heartfelt story about self-discovery and family secrets.

[sapphicliteratureirl · Rating 4 out of 5]

The narrative follows the dual perspectives of Marin and Charlotte as they both find themselves falling for a woman for the first time ✨️

After a bad accident, Marin is embracing a second chance at life. With a new job teaching statistics at a university and a new home in Vermont, she’s ready for a fresh start — including exploring her sexuality. I loved this narrative: Marin, at 47, joyfully embracing life and wanting a girlfriend for the first time. Her excitement is infectious. Watching her join a dating app and put herself out there is light, fun, and genuinely heart-warming.

Charlotte has also recently moved and is drawn into a mystery involving her mother. Her growing friendship with Marin leads her to question her own sexuality, and their dynamic is warm, fun, and wonderfully developed. I loved the steady way the author shows Charlotte’s realisation that she’s interested in Marin — and when she starts finding statistics hot, you know she’s got it baaaaad 🫠

The slow build suits where both characters are emotionally, making the romance feel earned. The chemistry and spice are ⚡️ and sensual, before the story picks up pace. There’s some major drama towards the end that I didn’t see coming. I also really appreciated the inclusion of chronic pain representation, and it was a joy catching up with Audrey and Michelle from 'Learning Curves' 😍

Thinking back to Marin and her love of statistics, the odds of this romance ever happening felt low — neither woman ever imagined it. That’s what makes this such a lovely story about taking a chance ❤️

[Yolanda | yolandaannmarie.reads · Rating 3 out of 5]

[arc review]
Thank you to NetGalley and Montlake for providing an arc in exchange for an honest review.
Margin of Error releases February 3, 2026

“Not everything can be explained by statistical models, even when you account for the margin of error. Sometimes, you have to trust your instincts and believe in the unbelievable.”

Two years ago, Charlotte’s life was altered when she stepped onto a bus and shared her daily horoscope with the woman sitting next to her, only to end up holding her hand as the woman laid dying on a sidewalk from a car crash.
Desperate for a sense of purpose, Charlotte has returned to her hometown in Vermont in search of answers as to why her mother vanished thirty years ago, but is caught off guard when her newest client as a realtor just so happens to be the woman from the bus whom she thought died.

Let’s start with the things I loved about this book. Marin’s character arc stole the show; I admired her strength in going out of her comfort zone, coming out later in life, and finding a second chance. Her chronic pain was also portrayed really well.
As for the romance, it definitely wasn’t the strongest considering the fact that Charlotte identified as straight for most of the story. At times, the bond between Charlotte and Marin felt more like transference due to the traumatic event they shared, rather than genuine attraction.
I would’ve loved if the reparation between Charlotte and her father had played a larger role in the story to balance out all of the scenes with the puppy.

Margin of Error is a companion novel to Learning Curves. While they can both be read as standalones, you’ll definitely appreciate the cameos of Audrey and Michelle more if you start with Learning Curves.

[Jasmine Shouse · Rating 3 out of 5]

3.5 stars

I really enjoyed the first half of this book, but, as it went on, I got less interested until the emotional whiplash like the one that started this book.

Ember is perfect. I also recently got a black lab pup, and Ember was exactly like my dog.

I loved Marin's arc and related to her in a lot of ways. The chronic pain and PTSD rep felt really well done. In contrast, Charlotte annoyed me. She barely seemed to be looking into her mom's disappearance despite moving back for that purpose.

I liked seeing Audrey and Michelle from Learning Curves, though what they went through was rough to read.

This book is part lighthearted, part traumatic, and total gay discovery. Pay attention to Content Warnings!

Thank you to NetGalley and publisher for the opportunity to read and review.

[Julia Van Dyke · Rating 4 out of 5]

NetGalley provided this book to me as an ARC in exchange for my honest opinion. My first ARC!!!

This book was pretty cute, but there was a lot going on in it. I loved the characters and their growth, and their love story was very sweet. Charlotte and Marin each had their side stories going on as well, which were interesting and unique. Overall, I enjoyed the book.

That being said, this book was surprisingly intense. There were a couple of scenes that were intentionally shocking, but were much more in depth than I would have expected, given other aspects of the writing style. I wish I could say more about that, but I don’t want to spoil anything.

Margin of Error was also pretty repetitive. By the end of the novel, I found myself starting to speed read because I often felt like I already knew the gist of what some of the paragraphs were going to say. Some of the repetition felt intentional, perhaps to drive certain points/characteristics home, but some other repetition felt more like the author hasn’t been sure where to put a section and therefore put it in multiple places.

Another thing that bugged me was the level of detail. With events and settings, the details were vivid and often beautiful, but then the dialogue had a distinct lack of detail. In fact, the dialogue felt pretty stiff to me in ways that didn’t feel like they fit the characters.

I’m ultimately glad I read this book as my first ARC. It was a quick, cute, and easy read. 3.75 stars, rounded up

[brooke · Rating 4 out of 5]

ARC REVIEW !!!

4.5 STARS ⭐️

“You’re right that I’ve been running… hiding. I’m a total mess, but I want to be better.” “You can stop running now.”

❄️🐾🧣🚑☁️🏙️☕️🚨🏔️🪬📦🔑📊💼

I am so thankful that I received an ARC copy of Margin of Error and I am super grateful for Rachel Lacey for sending it my way!

Hopping into Marin & Charlotte’s story was really sweet. I must admit that this book was different from what I was expecting after reading Learning Curves. I wasn’t as invested in this love story as Learning Curves but it was still sweet. I love a good friends to lovers troupe and these two ladies are most certainly fated, written in the stars, destined to end up together. Reading Charlotte’s POV in the prologue had me so invested and I knew that we were in for a crazy ride.

“They smiled at each other, and that felt like a sign too. Of what, Charlotte wasn’t sure. But…Something.”

Trigger warning that should be addressed in Margin of Error - near death experience, PTSD, homophobia, internalized homophobia, traumatic accidents, and death/talk of death

In Margin of Error you have Charlotte Danton who just recently moved back to her hometown to solve the 30 year long mystery of her missing mother, reconnect with her father, and maybe find herself along the way. She is swearing off romance and partners after her last relationship with her boyfriend went up in flames. All of this came into place after watching someone die just 2 years ago and it changed her life… for the worse. Being back in Middleton she is remembering all of her bad memories and she just wants to keep them buried deep down but as she meets a new best friend, reconnects with people from her past, and is faced with some surprising truths she has to open MANY can of worms.

“New year, new Charlotte? The problem was, she’d tried out a “new Charlotte” so many times, she almost didn’t know who she was anymore.”

Marin Easterly is recently divorced, recently out as a lesbian, and recently employed at NU in Middleton she is starting over. She is finally living a life for herself at 47. She has waited over 20 years to be her true, authentic self. After a near death experience 2 years ago and a random blonde hair woman on the bus she chose to switch up her life and make a change. She is desperate for love, passion, and a life partner…with a woman. She wants to be open with who she is and stop letting her accident define her. She wants to adopt a puppy and find a wife and she is willing to do anything to make her dreams come true. But, she isn’t expecting to see the blonde haired woman in Middleton 2 years after this accident. She has to figure out how to keep those feelings quiet, just like she did for 20 years of her life.

“No more hiding. That's the promise I made myself when I left Andrew. I won’t apologize for who I am…”

Troupes - femme/femme, hurt/comfort, over 40’s, small town, new beginnings, coming out later in life, mystery, rescue puppy rep, one bed, friends to lovers

“If I’ve learned anything over the last few years, it’s this: Not everything can be explained by statistical models, even when you account for the margin of error. Sometimes, you have to trust your instincts and believe in the unbelievable.”

[RomanceReadingJess · Rating 5 out of 5]

I absolutely adored this book. It was like the warmest winter hug, but still had moments of mystery, intrigue, and angst. Rachel Lacey’s writing is top tier. You can just feel all the emotions on every page.

Charlotte and Marin both had so much character development throughout this story and it was a beautiful story to watch unfold. Now this was a sloooow burn. Even slower than Learning Curves, so it was a bit of torture, but it was SO worth it. The yearning, the restraint, the tension.. it was perfect.

And Ember! The most adorable little side character ever! I love how a pet can add so much emotion and happiness to a story! The emotional stability and support that Ember provided for Marin was so heartwarming and I just fell in love with that puppy right along with them.

This was a late in life coming out mixed with a bi/pan awakening and these two characters shared so many firsts together, but Rachel wrote it all in the best way with so much care and understanding between them. I devoured this book in 24 hours. I finished it at 2 AM and I have no regrets.

[Miranda · Rating 4 out of 5]

When I saw that this ARC was available on Netgalley as a Read Now book, I immediately had to grab it, even though I hadn’t read Learning Curves yet! I have to say that I don’t regret it at all, because I loved this book.

One aspect of the book that I appreciated a lot, is that both Marin and Charlotte realize that they are not straight later in life (in their 40s).. Throughout the book we get to see Marin’s firsts - her first date with a woman, her first kiss with one, as well as all the emotions that come with it. At the same time, we get to see Charlotte come to the realization that she has feelings for Marin. I can see how this book would really appeal to queer individuals who came out later in life, or are still closeted..

I loved how Charlotte and Marin met - it is one of the most unique meet-cutes that I have read in a book. Yet, while them meeting again does feel like fate, they do not fall instantly in love. Instead they develop a beautiful, yet intense friendship. One thing that I appreciated about their friendship is how Charlotte is so supportive of Marin as she deals with her chronic pain.

The final character that I cannot forget to mention is Ember! I grew up owning labradors, so when I saw that one of the MC’s adopts a labrador puppy, I was so excited. He’s so cute, and his antics bring a lot of levity to this story.

The reason why I removed .75 stars from my review is in relationship to the plotline of Charlotte’s mother’s disappearance. While we get to see Charlotte’s interaction’s with characters from her mother’s life, this plotline felt flat to me. This also contributed to the ending feeling a little rushed.

[emily.reads.sapphic · Rating 5 out of 5]

First, I want to thank Rachel Lacey and NetGalley for an advanced listener copy of this book! I also gotta say that Quinn Riley did an incredible job bringing Marin and Charlotte to life!

From the prologue, this book had my full attention and pulled at all my heartstrings. I’m not gonna lie- I hadn’t really fully read the blurb, so what happened was kind of a shock to me, but in the absolutely best way (I would do it again 😂). These two had no clue that fateful day would lead them both to a town in Vermont where they unexpectedly reunited. UGH I love these two so much!

Marin coming out late in life after getting divorced and becoming comfortable being loud and proud about her s€xuality. She has waited oh so long to date women. To watch her take charge of her life, not only in her career pursuits, but also with how intentional she was about putting herself out in the dating field was 🤌🏻✨️

Charlotte moved back to her hometown hoping to find answers about her mom and repair her relationship with her dad. What she didn’t expect was to run into the woman from a day that completely changed her life, and for that woman to flip her life upside down for a completely different reason.

I haven’t read many books with MCs in their 40s- Marin and Charlotte are two people who have already experienced so many things. They are both learning what it means to do what they want and let who they want into their lives simply because they want to, not because someone or society has told them too do so.

And OH MY GOD wittle Ember, the runt of the litter that claimed Marin from the first time they met. She literally was exactly what Marin needed and is deserves the best puppy of the year award.

This was by far my most favorite Rachel Lacey book to date!

[Sophie · Rating 4 out of 5]

Probably, because of my age and personal preferences (I definitely lean toward lighthearted, funny romcoms and I’m not a big fan of the friends-to-lovers trope), I’m not exactly the ideal reader for "Margin of Error". Still, I really enjoyed the atmosphere: the wintry setting, the cozy vibes, and the tender romantic tone of the love story!

The plot focuses strongly on the theme of coming out, and at times it reaches some very emotional and even dramatic moments. It’s not a topic that personally resonates with me, but I truly appreciated how sensitively and respectfully the author handled it, especially in showing how complex and deeply felt family dynamics can become during such a vulnerable time.

I liked both main characters: they have wonderful chemistry, and I think many readers over forty will especially relate to their quiet moments of mutual support and gentle understanding. The subplot about Charlotte’s missing mother doesn’t always blend seamlessly with the main storyline, but it does help keep the pacing lively in parts where the narrative otherwise feels a bit too slow. (Because cozy vibes are great, but we probably don’t need to know every detail about Marin’s puppy’s bathroom schedule or Charlotte’s daily breakfast, right?)

That said, the first meeting between the two MCs is absolutely thrilling: fast-paced, full of energy, and genuinely memorable. I also loved the ending; it felt emotionally satisfying and left me with a smile!

If you enjoy sapphic romances by authors like Melissa Brayden, Alexandria Bellefleur, or Clare Lydon, I’d definitely recommend giving this one a try!

(Thank you to NetGalley and the publisher for providing an ARC of this book in exchange for an honest review.)

[Kasley.K · Rating 4 out of 5]

Sapphic romances with mature leads are often a pleasure to read. For someone who is still young, reading about women who start over or discover themself despite being considered too old to do so (according to old society beliefs) is a source of joy and reassurance. Margin of Error perfectly reflects these experiences.


I found Marin and Charlotte’s first meeting memorable, and I enjoyed Charlotte’s approach to astrology. To follow Marin in her journey was such a pleasure; I found myself rooting for her each time she reached a new milestone.

Charlotte’s quest for answers was a hard one, and I liked how it conflicted with her discovering the nature of her feelings for Marin. I have to admit that I got a bit mad at her.


Ember made me swoon so much. She seemed so cute and sweet. The way she helped Marin warmed my heart.

It’s always cool to see characters from previous books, so I was happy to get some news from Audrey and Michelle, even if… well. You will have to read it to know.


Rachel Lacey keeps making me want to go to Vermont. The descriptions make me want to travel there without all the complications that come with going to the U.S.

Margin of Error is a great winter read if you’re looking for a story about starting over and finding love at an older age.

[Chelsea Pitsos · Rating 4 out of 5]

• ARC/ALC REVIEW •

Margin of Error x Rachel Lacey
Out: 2/3/26
Spice Level: 🔥🔥
Version: 📖/🎧

Listen, I am no stranger to Rachel Lacey’s books — but I am always blown away by her writing! Her blend of sapphic yearning, drama, and character development has me constantly in awe! I was not only lucky enough to receive a physical ARC of MoE but also an ALC — narrated by the incredibly talented Quinn Riley and goodness do I feel spoiled!

I am an avid “hybrid” reader, so switching back and forth between listening and reading was such a treat. I got to hear the characters brought to life beautifully, so I would absolutely recommend either version if you prefer listening via audio to reading with your eyeballs!

My jaw was on the floor for the prologue and first couple of chapters — I immediately told my wife about it and she was sitting on the edge of her seat! Her first comment was “omg that needs to be a movie, I would absolutely watch that— let me know what happens!” The mystery aspect was such a nice touch, it kept me guessing the different outcomes until I reached the ending!

It was great to revisit the MCs from Learning Curves and the added aspect of the puppy! It’s clear to me that Rachel Lacey never misses; if she writes it — I’m reading it! A beautiful romance, filled with drama, mystery, and steam! Don’t miss this one!

[callistoscalling · Rating 4 out of 5]

Thank you to the publisher for a gifted copy; all thoughts are my own!

📖 Book Review 📖 How many times in your life have you muttered the phrase, “What are the chances?” While you most likely do not know the probability, Marin is a statistic girl through and through but a near death experience has her risking it all for a second chance at her authentic life. Two years after an accident in Manhattan, she revamps her entire life in rural Vermont and starts afresh as a lesbian college professor.

What are the chances she comes face to face with the woman whose face was the last one she saw before nearly crossing over for good? For book stats, we’ll just say very unlikely. As Marin and Charlotte bond over their shared experience and get to know each other, their connection grows in an unexpected way that surprises both of them in the most beautiful fashion. Margin of Error is the cutest, not-at-all nerdy sapphic romance imaginable!

[Katelyn Kongable · Rating 4 out of 5]

I really enjoyed this story. We have Marin and Charlotte who are both in their 4os which I absolutely loved about characters who are a bit older than I typically see in romance novels. They are both starting over after a traumatic event that happened to Marin causes them to reexamin their lives. It was very beautiful to watch Marin be able to be out for the first time and be so happy. She was making decisions for herself and I loved seeing that. It was also cool to see Charlotte and Marin's friendship grow authentically and become something more over time.
I did feel like their were moments were the story felt a bit disjointed with the mystery aspect involving Charlotte's mom.
Overall I enjoyed this book and I think you will too especially if you like sapphic love stories and cute puppies!

[kelsee · Rating 5 out of 5]

WOW. Margin of Error was more shocking and intense than I expected it to be. The characters go through some real stuff - BUT this is what brought me to love it so much! Seeing them go through these difficult things in life and learning more about themselves was inspiring.

Marin and Charlotte won my heart and I saw myself in both of them. Both are late blooming sapphics and their experience with that was written so well! Aaaaaaand friends to lovers is by far my favorite trope and it was so perfect in this book.

Overall, definitely recommend - and I’m so glad we got an update on Audrey and Michelle from Learning Curves, too!

[:) · Rating 4 out of 5]

This book is a perfect mix of sapphic romance, complicated pasts and discovering yourself. I loved how horoscopes and fate seemed to get in the way, resulting in this beautiful love story. Both main characters had a lot to accept and grow, and, most of all, learning how to do it together. It's a strangers to friends to lovers story, takes its time to build up, making it all make sense in the end. I really liked it and recommend to anyone who likes contemporary romance and women in love.

Received an e-arc from netgalley in exchange for an honest review. Thank you for the opportunity!

[Lynsey ❤️‍ Hot Flashes Hot Listens · Rating 5 out of 5]

Format: Audio
Solo Narration by: Quinn Riley
Heat: 2.5/5
Run Time: 12h
Audio Source: Advanced audio copy courtesy of Rachel Lacey (thank you!!)

Series or Stand Alone: Stand Alone- though same universe as/ appearances by characters from Learning Curves. I had not read Learning Curves and wondered if perhaps the characters were from that book when I read them! No need to read Learning Curves first but now I want to go read it next to learn about Audrey and Michelle!

Tropes & Notes: Fate • Stats Professor & Real Estate Agent • Vermont College Campus Setting • Friends to Lovers • Sapphic Romance • Sexuality Discovery • They’re Each Other’s First • Coming Out • Pet as Main Character (!!) • Chronic Pain Rep • Loss of Parent • Vehicle Accident • Check Content Warnings 🩷

Recap Quickie
Charlotte and Marin share a lovely meet-cute on a city bus in NYC just before Marin is suddenly hit by a vehicle and Charlotte believes her to be dead. Fast forward two years later- they’ve both moved to the same college town in Vermont and Charlotte just happens to be Marin’s real estate agent! Much has changed in their lives and Charlotte ends up being the very first person that Marin comes out to. They become fast friends but neither can help the feelings growing for each other. Charlotte thought she was straight and is trying to understand what her attraction to Marin truly means. Margin of Error is the sweet and emotional story of two women navigating their first romantic relationship with another woman- on top of also balancing complicated family dynamics, trauma, as well as the sweet parts of life (like Ember, the cutest puppy ever)!

My Thoughts
I really enjoyed this story! Though there are funny moments- it was more of a loving and emotional story with lots of focus on Marin and Charlotte and little Ember who was the cutest book-dog ever and has a pretty big role!

I loved the different aspects of Marin’s personality: her insecurities as a new pet owner, her confidence as a stats prof, her vulnerability as the survivor of a near-death experience, and her excitement for her new life as an out lesbian. And I loved Charlotte’s loving kindness and friendship. She was always showing up with coffee or muffins or sandwiches! Charlotte also was a touch more forward once the spice arrived between these two and that was also a fun side!

The pacing was good- I love that Rachel Lacey jumps over angsty waiting periods so that the reader doesn’t have to sit in the stress (thank you Rachel)! This is probably my first true sapphic/ wlw book and it was lovely!

Narrator Vibes
Quinn Riley nicely differentiated Marin and Charlotte. She made Marin feel matter-of-fact yet kind and very eager for her new life. With a subtle change, she was able to bring the warmth and fun to Charlotte’s character!

One thing that can be a little tricky with audio is when the chapters are long and you miss out on the visual cues of sections/ headings that print/ ebooks offer. So even though I loved jumping over those angsty periods, sometimes it took me a minute to catch up because while a new section had started- it felt like back to back sentences to me. This is not a critique- just an observation.

40+ Reader Appeal? (Not Considered in Rating) This is the first book I’ve read /since my reading journey reignited that an FMC has been OLDER than me! It was the best! Both main characters were in their 40’s. I think this perhaps allowed the story to focus on the simple joys of life without the pressure that dating in your 20’s and 30’s can bring. It just felt less stressful (and that could also be the absence of male energy). Regardless, I loved it!

For more 40+ audio romance takes, check me out on Instagram @HotFlashesHotListens!

[Sandra · Rating 5 out of 5]

4.5⭐️
Another great new romance novel by Rachel Lacey, once again set in the academic world of Northshire University. What are the odds of meeting the same person twice in two different places, in New York and in a small town in Vermont?

Charlotte (40, real estate agent) returned to the small town in Vermont where she grew up to finally find out what happened to her mother many years ago. Until two years ago, she believed in horoscopes. But after witnessing the woman she had just been talking to on the bus get hit by a car, she stopped reading her horoscope.

Marin (47) narrowly survived this accident two years ago in New York. Her aching body will always remind her of that fateful day. The only positive thing about the accident was that it finally gave her the courage to live her life the way she really wants to: being herself, dating women, and being a teacher. She is starting her new life at Northshire University in Vermont. She never thought she would see the woman from the bus ever again.

Rachel Lacey always writes stories about real-life people. Not flawless characters or superheroes, but people like you and me, with all their faults. These middle-aged women experience true love for the first time in their lives when they dare to take the plunge. When you fall in love with a woman for the first time at around 40, it can really shake up your worldview. And all the life experiences you have don't even help you much; it can also prevent you from standing by your feelings.

The story has some very intense and frightening moments, which are balanced by lighter sequences that are woven together to form a beautiful story. Marin impressed me from the very beginning. With her strength and determination to come out, her hope of finding fulfilling love, and finally shaping her life the way she wants it to be – and not letting herself be limited by the lasting effects of the accident. For Charlotte, her growing romantic feelings for Marin come as a big surprise when she realizes that she wants more than just friendship. But the search for her mother preoccupies her too much to think about it.

The author once again manages to convey all the feelings, confusion, fear, and joy. Coming out to the family is liberating, but can also be quite stressful at times. The storyline of the two women's first meeting and reunion is certainly unique, heartbreaking, but also heartwarming. How they slowly find their way in life and to happiness is once again wonderfully told. A big help to find all that is Ember, the cheerful and adorable puppy that everyone will fall in love with. And we meet again with Audrey and Michelle from book #1.

Thank you to Rachel Lacey and NetGalley for receiving an ARC.

[Kristene · Rating 5 out of 5]

⭐⭐⭐⭐⭐⭐ (If six stars were allowed)

Margin of Error by Rachel Lacey
Sapphic romance featuring women in their 40s
Spice level: 🌶️🌶️🌶️✨ 3.5 out of 5

Content and trigger warnings:

Car accident, loss, near fatal accident, nerve pain, chronic pain, and body limitations.

Also, if you have recently lost a dog, the puppy storyline may make you cry. 👀😭 (the dog doesn’t die, it’s just so sweet!)🐶

I absolutely loved this book. I could easily give it six stars and leave it at that, but Margin of Error deserves a fuller reflection.

While you do not need to read Learning Curves to understand this story, reading it does add depth and richness. I am really enjoying this Vermont university setting, and I sincerely hope Rachel Lacey continues writing stories in this world.

The Beginning:

The opening chapters completely surprised me. I was not expecting how the story began, and that emotional impact hooked me immediately. From that point forward, I could not put the book down.

The Characters:

I loved that both main characters are women in their 40s who are starting over in very real and meaningful ways. Their experiences felt grounded and relatable, and I found myself connecting personally to both of them. The character development was especially strong for Charlotte, whose growth felt thoughtful and well earned.

The Mystery Element:

If you enjoy a touch of mystery woven into your romance, this book delivers that as well. Rachel Lacey includes a mystery subplot that keeps the story engaging and adds meaningful depth, especially to Charlotte’s character. Rather than distracting from the romance, the mystery enhances the emotional arc and gives additional insight into Charlotte’s past, motivations, and inner world. It added tension and curiosity in a way that felt purposeful and well integrated.

The Puppy 🐶:

Many sapphic novels feature cats, which I adore, but the inclusion of a puppy was such a refreshing change. The puppy felt like a storyline of its own rather than a background detail. The book captured the intensity, exhaustion, and tenderness of caring for a puppy in a way that felt incredibly realistic and heartfelt.

The Writing:

The writing style was comfortable, casual, and easy to follow. It allowed me to fully settle into the story without effort. This is only the second book I have read by Rachel Lacey, and it solidified my desire to read much more of her work in the future.

The Relationship:

The relationship felt deeply realistic, especially for two women in their 40s exploring attraction, vulnerability, and identity. I especially appreciated the internal reflections, particularly Charlotte’s. Reading her thoughts brought me back to my own coming out experience and those quiet moments that only make sense in hindsight. It felt validating, honest, and emotionally true.

The Spice 🌶️:

The spice was perfectly placed and never overwhelming. It felt natural to the story and enhanced the relationship rather than distracting from it. Rachel Lacey writes intimacy in a way that fits seamlessly into the narrative, which I truly appreciate. I felt the spice rating aligns with a 3.5/5, but some may consider it a 4/5.

Overall Thoughts:

This was such a cozy and emotionally rich sapphic winter read. I actually read it out loud to my wife while we were in bed at night, and I can confidently say it is a wonderful book for couples to read together 🥰

If there are more books planned in this Vermont university sapphic world, I will be eagerly waiting and happily collecting the entire series ✨

[Tammy · Rating 4 out of 5]

📚Margin of Error
✍🏻Rachel Lacey
Blurb:
From Rachel Lacey, author of Learning Curves, comes a tender, hopeful romance about how fate is what you’re given but love is what you choose, and how small sparks can change everything.

Two years after an accident in Manhattan almost claimed her life, Marin is determined to take advantage of her second chance. She’s left her husband, her job, even her home to pursue the life she’s always wanted. Now she’s teaching statistics at Northshire University and preparing to do something she’s spent decades dreaming about: date a woman. But the last woman she expects to encounter on her journey is the one she’s been fantasizing about since their chance encounter the morning Marin nearly died.

Charlotte has made big changes in her life since that fateful day too. Most importantly, she’s moved back to her Vermont hometown, determined to finally solve the thirty-year-old mystery of her mother’s disappearance. An unexpected—and unexpectedly intense—friendship? That wasn’t in the plan. Neither was questioning her sexuality, but the more time Charlotte spends with Marin, the more she realizes her feelings run deeper than friendship.

Surely this would be a disaster, both of them being each other’s first, except the chemistry between them feels too strong to deny. But as they get to the heart of the mystery—and the heart of who they are—what brought them together just might tear them apart.
My Thoughts:
This charming sapphic story is low angst but full of heart – perfect for someone looking for a cozy read on winter day.
Margin of Error drew me in at the prologue and kept me hooked for the entire read. This story follows Charlotte and Marin, both in their 40s as they are coming to terms with their sexuality and coming out later in life. This is a friends to lovers story where I really felt the emotions of both women. I was rooting for them as they became new friends and were drawn to each other. The addition of sweet puppy Ember to Marin’s life just added to the story. It was also fun to see Audrey and Michelle (from Learning Curves) again.
Thanks NetGalley, Montlake Publication and Author Rachel Lacey for the advanced copy of "Margin of Error" I am leaving my voluntary review in appreciation.
#NetGalley
#MontlakePublication
#RachelLacey
#MarginofError
⭐️⭐️⭐️⭐️

[Rhiannon · Rating 1 out of 5]

Rachel Lacey has been on my radar for a while, but I was a little hesitant to try her books because, generally speaking, I seldom connect with contemporary sapphic romance novels. Still, I was hopeful that I would enjoy this book—and Rachel's work overall—because of the hype surrounding her other titles. As I'm sure you can tell based on the 1-star rating, I did not.

I do want to start by highlighting the things I thought this book did well, which include having a lesbian MC who regularly uses the word "lesbian" to describe herself; having two MCs in their 40s; and discussing somewhat difficult topics like chronic pain, coming out, homophobia, and the death of a parent. Unfortunately, none of that was enough to overpower my dislike of the writing style or complete lack of interest in the plot. The writing itself was extremely casual and simplistic, and I didn't resonate with the humor or care for the pop culture references. It always drives me nuts when authors feel the need to spell everything out for readers rather than trusting them to make inferences and understand things that aren't explicitly stated, and that was the case throughout this book. As for the plot, I think this book suffered from trying to do too much at once. There was the main storyline involving Marin and Charlotte's developing relationship, and most of the smaller plot points directly related to Marin's experiences with starting over post-divorce and moving to Vermont, the totality of which seemed a little too busy for such a short book but also made sense thematically. On top of all of those things, however, there was also a storyline focused on Charlotte reconnecting with her dad and seeking answers about her mom, who disappeared when Charlotte was a child. It felt out of place amongst everything else and was also a bit odd to read about because it only came up a few times and then had a somewhat rushed and coincidental conclusion right at the end of the book.

Anyway, didn't love this. I struggled to care about the MCs, especially Charlotte, or their relationship much and was consistently put off by the writing style and quality. But, if you're more of a contemporary romance reader than I am and enjoy easy, somewhat corny reads, YMMV.

Thank you to NetGalley and Montlake for an advanced copy in exchange for an honest review.