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When the remains of a young murder victim on Nantucket Island are discovered after thirty-five years, a detective begins to unearth the dark secrets of a community gone silent.

Massachusetts State Police detective Tommy Kelly is called to Nantucket Island, where a boy’s skeletal remains have been discovered at a construction site—interred for thirty-five years. The crime is especially gutting for Tommy, the father of two boys. It’s also the beginning of a grim mystery. Because no child during that period was even reported missing.

Tommy is partnered with Nantucket PD’s best detective, Jo Harris, who first chafes at the idea of a mainlander encroaching on her territory. And their work together is only raising more troubling questions. Then a possible link is found to the decades-old case of a serial killer—a vigilantly hidden part of the past that this tight-knit community would prefer to forget and never speak of again.

The secrets in their silence are so shocking they soon pull Tommy into a very dark place. Suddenly, offseason on Nantucket has never felt so cold, so isolating, or so dangerous.

238 pages, Kindle Edition

First published September 1, 2025

5000 people are currently reading
9031 people want to read

About the author

Peter Colt

13 books122 followers
Peter Colt is currently a police officer in a small New England city where he has worked since 2007. He spent over twenty years in the Army reserve and was deployed to Kosovo in 2000, where he was attached to the Russian Army. He was deployed to Iraq in 2003 and again in 2008. He was fortunate to get to know many Vietnam vets and U.S. Army Special forces soldiers. He lived on Nantucket Island from 1973‑1986. He’s currently working on the next Andy Roark mystery.

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5 stars
3,825 (36%)
4 stars
3,954 (37%)
3 stars
2,132 (20%)
2 stars
520 (4%)
1 star
165 (1%)
Displaying 1 - 30 of 428 reviews
Profile Image for Stacy.
550 reviews16 followers
August 2, 2025
Ugh. This book sounded great and I am so disappointed that it wasn't. A lot of this book is rather boring as the detectives search through old files of missing boys, trying to identify the bones. There's also a lot about Kelly exercising and eating that wasn't necessary. It finally picks up once the Chief arrives and the remains are identified. I was enjoying it from that point on, and I also enjoyed the flashback scenes throughout. Then a stupid twist ruins the whole thing. Other than the terrible twist there were some editing issues as well. Early on, Kelly won't eat a tuna sandwich because of the mercury, yet a little later he has a couple tuna sandwiches for lunch then goes grocery shopping and buys tuna to put on his salad. So, does he have a problem with tuna or not? I also thought having a cop named Jo and a cop named Joe was a weird decision. I imagine that would be confusing in an audiobook. Then there were repetitive scenes like Jo asking Kelly why he didn't hang up on his wife, he explains, then a little later she asks him again. Still, I thought the overall story was interesting enough that I was prepared to give Cold Island 4-stars, until the dumb twist ruined it. I would not recommend this book.
Profile Image for Stitching Ghost.
1,505 reviews389 followers
December 19, 2025
I can't go into why this one was a 2.5 stars (rounded up for Goodreads) for me without spoilers, read the following at your own risk if you intend to read this book.

I'm not a fan of books where a character to begin with and here it was done rather clumsily in my opinion. Didn't help that it's the second book I've read with that sort of deal in the last few days so part of my annoyance with it does not lie entirely with the book itself.

The dual timeline was pretty well done however and it was easy to follow as one POV is that of a child (a well written and convincing child too, his parts were really the highlight of the book for their quality) and the other is a full-grown adult.

Kelly, first name Tommy though you would be excused for forgetting that since he's almost always called Kelly, our MC, was a surprisingly bland character, detectives with a little bit of a drinking problem are my thing normally but his problem seemed mild and everything about him was just kind of just somewhat of an inconvenience more than any sort of a big deal even his borderline eating disorder (I say borderline because it's at that stage where it might just stay that kinda sad "quirky" thing about him or it might devolve into something more) and his acrimonious relationship with the mother of his children.

I might give this series another go as I'm still sort of curious about where Colt is going to take things for Tommy.
Profile Image for Tessa.
Author 7 books663 followers
July 1, 2025
When the skeleton of a child is found on Nantucket, State Police investigator Tommy Kelly and local detective Jo Harris are faced with a series of decades-old abductions and the possibility of a killer who was never brought to justice. Gritty, authentic, and brimming with New England atmosphere, Peter Colt’s excellent COLD ISLAND asks what happens when a cold case hits home and a community closes ranks. Jane Harper fans, welcome to your new obsession.
Profile Image for Travis.
6 reviews6 followers
August 11, 2025
weak plot

In the first half of the book, a body is found. That is all. The characters spend too much time eating, drinking, and flashbacking. When the solution happens, there is no surprise. The lead character's family problems take place off stage.
The more I think about 3 stars seem too generous. Maybe 2.3 stars.
Profile Image for Watchdogg.
217 reviews5 followers
December 6, 2025
Cold Island (Detective Tommy Kelly #1) by Peter Colt
First published September 1, 2025

Summary -
Massachusetts State Police detective Tommy Kelly is called to Nantucket Island, where a boy’s skeletal remains have been discovered at a construction site—interred for thirty-five years. The crime is especially gutting for Tommy, the father of two boys. It’s also the beginning of a grim mystery. Because no child during that period was even reported missing.

My thoughts -
This book left me confused and wondering what was the author thinking?

At one point the author makes it clear that every conceivable effort was made to keep secret 35 years earlier the murder of three young boys. This concerted effort was made to protect the image of Nantucket as the go to summer playground for the wealthy. Islanders did not want their cash cow harmed in any way by the brutality of these crimes. That being said, why then did the Chief of Police (who had been one of the investigating officers when the crimes occurred) request the assistance of off island authorities when the bones were discovered?

What were the Bilbo delusions all about in the late pages of this book? Absurd.

And the biggy - The off-island State Police investigator sent to the island to assist turns out to be the fourth child victim 35 years ago who was able to escape? Another absurdity. Given his childhood experience, the mystery as to the identification of the bones should have been a cake walk.
This entire review has been hidden because of spoilers.
Profile Image for Greg Kerr.
456 reviews
December 6, 2025
Creative Caper With Interesting Twists

A well thought out police procedural with some likable characters. The author is very detailed, almost to the exclusion of the pace of the story. My only knock on the book.

The following paragraph was a breaking point; and it was only page 53! "Her raid jacket, what cops called the ubiquitous blue windbreaker with Police stenciled on the back, was draped over her chair. She pulled out of the lot and turned onto Fairgrounds Road. He was beginning to notice that the island was a mix of really old construction, as in colonial old, and newer stuff from the seventies and eighties mixed with new buildings built to fit in with the island vibe. It reminded him of some sort of New England–themed ride at an amusement park."

The fact that the "raid jacket" jacket was in Jo Harris's car added nothing to this paragraph. And to say it was "draped over her chair" vs over her "seat" made it sound like they were back in the office. Further more the author has an infatuation with naming every street that is taken while on the island. Okay, you know your way around Nantucket already, get to the story. Case in point: "At the end of Fairgrounds Road, she turned on to Surfside Road and headed into town." Blah, blah, blah ... "she headed into town". Or: "They got into Harris’s car. She drove around the gym, took a left, went through a stop sign, and pulled into the hospital parking lot after a hundred yards." ... "They drive to the hospital that was basically across the street."

But the story is worth working through geography.
Profile Image for Scott R Ficarra.
77 reviews
August 15, 2025
A quick read. Why? Because many pages were spent describing in great detail the geography of Nantucket. And not just the topography but street by street. I didn’t need to know the each street by name when Kelly went for his morning runs. So I skimmed and didn’t miss a thing.
About 70% of the book was about the protagonist, Kelly. His failing marriage, his daily runs, what he was eating and where and of course the all too anticipated affair with the local female detective he was assigned to work with. Very little about the actual plot.
But finally the last quarter of the book became focused on the story and thankfully there was a nice twist at the end.
Profile Image for Morgan Noel.
55 reviews
August 9, 2025
Went in really wanting to enjoy this book but found most of it quite boring until the last 25%. Some of the issues I had with this book was the constant use of the word dick. Maybe I’m missing a context for it but it just felt like the word was used over and over and over again when other words could’ve been used it it’s place. I also found many repetitive lines in the story. It happened a few times and I would end up having to go back and reread certain pages because I was thinking, “wait didn’t I already read this??”. Also, the hallucination of Bilbo at the end of the book was ridiculous. I understand him seeing Bilbo when he was a kid, but the adult hallucinations just felt forced and out of place. Also, I made the connection between Albie and Kelly before halfway through the book. I wanted to like it more than I did, but just felt like it fell short in a lot of places.
This entire review has been hidden because of spoilers.
Profile Image for quinnster.
2,586 reviews27 followers
August 10, 2025
This was terrible. First of all, I thought a 70 year old man wrote it, but it seems no? Also a third of the book is about Tom’s exercising and food intake (I am not kidding). It almost seemed like the author wanted readers to know how mind numbing police work could be because this explored that theory in detail. Then the twist and Tom’s hallucinations. Just not. This was a throw everything at the “wall and see what sticks” sort of book.
Profile Image for Denise.
2,419 reviews102 followers
September 10, 2025
Atmospheric, dark crime thriller.

Massachusetts State Police detective Tommy Kelly is sent to Nantucket Island to work with Nantucket police after discovery of remains at a construction site. The bones and detritus are thought to be about 35 years old, so Tommy and Detective Jo Harris try to sift through old missing persons reports to see if they can find a match to their victim — apparently a male child. Strangely enough, they can’t find anything that helps them to identify this boy. As they probe deeper, secrets that this small community have kept for years come to light.

This was written a bit differently than I’m used to reading. Lots of minute details about the island, the food eaten, and other tidbits that immediately made me wonder if all of that is being used as misdirection. Turns out, it was. Seems that there is a huge secret just waiting for a big reveal during the last part of the book that took me by surprise. But it did kind of seem like a gotcha and I was afraid that the story was going to go off the rails for a minute until it got back on track. Still not quite sure how I felt about that. But, the basics of this plot were good though I was caught off guard. As far as the characters, well, I need to think about them. Some of what happened was predictable and I guess I’ll need to read the second book in the series to see what happens next. And I did like this well enough to want to do that.

I was able to listen to the audio book while also following along in the e-book ARC, both provided by the publishers. The narrator, Chris Ciulla, is a Boston native so his accents were perfect in this book. He gave the appropriate dramatic flair to the personalities and characters. His performance definitely enhanced my enjoyment of the story and provided an immersive experience.
Profile Image for JoyReaderGirl1.
765 reviews8 followers
August 21, 2025
When human remains are discovered on a Nantucket Island construction site, Massachusetts State Trooper Tommy Kelly is dispatched from Plymouth to head the investigation in Peter Colt’s dual-timeline murder mystery, “Cold Island,” and discovers more than old bones as he searches for the truth.

On island, Kelly is paired with a smart, by-the-books female detective, Jo Harris, and her father-figure mentor, the hands-off local police chief, also named, Joe.

Trooper Kelly is a disciplined fitness and health food fanatic who runs daily; shuns sugar, fat, and red meat; yet frequently over-indulgences in good Scotch to drown his personal demons ~ and he’s got a few.

Also, Kelly and other male cops in this book seem to have a limited vocabulary when it comes to descriptive nouns for law enforcement officers like themselves ~ other than the word, “dick.”

This is the 21st Century and that language is inflammatory, sexist and just plain offensive!!!!! Come on now. This is not a script for a 1930s B gangster movie.

Cold Island is a quick read that kept me engaged, yet annoyed. After much subterfuge, timeline and character development, the plot unravels in a few expected threads, as well as several unforeseen reveals that were surprising.

JoyReaderGirl1 graciously thanks AmazonFirstReads, Author Peter Colt and Publisher Thomas & Mercer.
Profile Image for Sam Jean.
55 reviews
August 14, 2025
i don’t know how i feel about this book. i picked up on the twist pretty early on which i never do, but was the twist good?? im not sure. i’ll leave it at 3 stars for now.

also why was he hallucinating bilbo baggins. that wasn’t necessary

overall was a fast paced book that kept me interested but i’m not sure i would recommend
Profile Image for Ruth.
608 reviews17 followers
September 21, 2025
Great Crime Story with an Unexpected Twist

Cold Island is a very good crime procedural with dual timelines and twists that pay off. The characters are entertaining and for the most part, likable. It’s always interesting to read a crime story told from the perspective of the police and the victims or criminals. This book does an excellent job giving voice to very young victims who frequently have complicated and painful personal lives. I had my suspicions about who the perpetrator was, but found I was quite a bit off base when the story got to the point of some big reveals. Highly recommend, and the audiobook narrator is very good.
Profile Image for Sue Dix.
738 reviews24 followers
August 31, 2025
The first in a new series, I can’t wait for the second. This novel went to a place I could not foresee. Talk about being blindsided. Detective Tommy Kelly is sent to Nantucket Island to oversee the discovery of a child’s body. The case is more than cold and there seems to be no chance of solving it when he and the local detective Jo Harris get a series of lucky breaks. This novel will flip you on your head. A great series beginner.
Profile Image for Terri Minton.
50 reviews
November 5, 2025
Slow first half of the book. I wondered why it spent so much time on his exercising but that made sense as the twists of the book were revealed. The second half picked up but was a little abrupt when the chief came back. Overall not a bad read.
This entire review has been hidden because of spoilers.
Profile Image for Heather.
600 reviews17 followers
October 11, 2025
2.5 stars

This book was a little too much schtick and repeated dialog to get a higher rating, but it was entertaining enough and has some twists. Michael Connelly he is not.
30 reviews
August 4, 2025
I will not be reading anymore books by this author

I love police proceduals , but this is definitely not Bosch. A quick summer read and after you leave the beach, forgettable.
Profile Image for Yoly.
117 reviews4 followers
November 22, 2025
If you love reading about crimes, police investigation and unsolved cases, this one is a real page turner!

This book set in beautiful Nantucket, is mysterious, chilling to the bones, thrilling and intense, with a twisty ending you would never see coming!!

This is the first book I've read from this author and definitely it won't be the only one.

...and it'll be a great movie or TV series!
Profile Image for Kari.
14 reviews
September 7, 2025
Slow start, but worth finding out what happened. A solid beach read and move on.
Profile Image for Victoria (storieswithtorie).
186 reviews10 followers
November 8, 2025
This one was solid but didn’t completely pull me in. The setting was atmospheric and I liked the classic detective tone, but the pacing felt slow in parts and I had trouble fully connecting with the main character. It had strong writing and a good mystery, just not quite the level of suspense I was hoping for.
Profile Image for Tom.
6 reviews
August 8, 2025
I wavered between 2 and 3 stars. The big plot twist (SPOILER ALERT HERE) was one that is one of my big peeves when I encounter it in a book or movie. I know it is not uncommon so a lot of people may be OK with it.

I consider a plot device unfair when it is revealed at the climax that the point of view character, who has been sharing their thoughts with the reader throughout the book, has not shared exceedingly important information about their own past which is integral to the plot. In Cold Island, there is no book without that device.
Profile Image for Ary.reads.
145 reviews7 followers
August 11, 2025
Cold Island delivers an atmospheric, slow-burn mystery set against the chilly, off-season backdrop of Nantucket. The discovery of a boy’s skeletal remains after thirty-five years sets Massachusetts State Police detective Tommy Kelly on a collision course with the island’s buried secrets. Partnered with local detective Jo Harris, Tommy faces initial tension, deep mistrust, and a web of silence that the tight-knit community has carefully maintained for decades.

The premise is gripping, and the setting is vividly drawn—you can almost feel the isolation and cold wind whipping off the ocean. The mystery builds steadily, with well-placed twists and a satisfying sense of unease. However, the pacing occasionally drags, and certain plot threads feel underdeveloped or resolved a bit too neatly.

Still, for fans of procedural mysteries with a strong sense of place, Cold Island is an engaging read that blends small-town secrecy, long-buried crimes, and layered characters. It’s a solid entry in the detective genre, though I wanted just a bit more tension in the middle stretch to keep the momentum high.
This entire review has been hidden because of spoilers.
Profile Image for Aly.
46 reviews
September 22, 2025
I came away a bit disappointed with this book. The synopsis promised a chilling story about a serial killer haunting a small town, but the execution didn’t deliver what I expected. There was potential in the decades-old mystery and the discovery of a long-buried body, but instead of an interwoven, suspenseful plot, there was an odd focus on Detective Kelly’s diet, mindset, and family life. While some background can add depth, here it felt unnecessary and didn’t contribute to his character development or the story itself.

The ending twist had promise but was lacking after the initial reveal and made the story more confusing. There were moments of intrigue, but the overall story fell short of being cohesive and gripping. I don’t think I’d reread this one, though I might give the author’s other works a try.
Profile Image for Ava.
18 reviews
August 16, 2025
Felt empty... shallow. This book makes Last Seen look good (I use Last Seen cause it’s another mystery book from Amazon I read recently). Absolutely nothing happening for 80% of the book. Didn’t expect or enjoy the twist. Maybe I just dislike [redacted] type twists though.

Outside the mystery, the book feels more like a juvenile fanfic with a self-insert character and situations. Poor man just working for his family but his wife who also has a job is evil. She wants him to help out and be present n shit—that’s crazy. he drinks nonstop but that’s not the problemmmm. (She did cheat so I’ll give em that ig)

Finally, author seemed to take a challenge to see how many times he could write ‘dick’ in a book. no one even uses that anymore. just write detective damn.
46 reviews
September 6, 2025
The genre I love more than anything is Police Procedurals, mostly British. I read a lot of them. This was pretty bad. It was amateurish and repetitive. Not sure if this would be considered a spoiler, but it wasn't until 60% of the book was done, after we'd read for pages and pages of the 2 detectives searching files,that the Police Chief said, oh hey....this happened in 1981. Also, considering the ending, looking back, its sort of ridiculous that Kelly was "clueless" about the crime until the Chief said that. Won't read this author again. At least it was a free book from Amazon.
Profile Image for Melissa Crawford.
135 reviews1 follower
August 8, 2025
Ugh. So much repetition and ridiculous dialogue. Interesting twist at the end, but not enough to make up for the uphill slog to get there. I really hate to be this negative about someone’s creative endeavor, but this may be the book that breaks me from being someone who always finishes every book I start.
Profile Image for Adam.
313 reviews
August 12, 2025
Strained dialogue. The characters personalities don’t make sense. The “twist” is unbelievable. Timeframes switch between past and present in the middle of a character reminiscing and then come back to present in a confusing way. Not a fan.
35 reviews
August 17, 2025
Good read with a surprise ending.

This book got off to a slow start, but by half way through, I couldn’t put it down. It kept me guessing until the end. All the pieces came together as the mystery was masterfully unraveled. The unexpected surprise revelations, all made sense. I will read another by this author.
Profile Image for Debra.
1,255 reviews19 followers
August 28, 2025
This was an enjoyable read with a creative story line. State Detective Tommy Kelly is ordered by his boss to go to Nantucket to help with an investigation. A child's skeleton is found buried during construction work. He is paired up with Detective Jo Harris, who of course isn't thrilled with the State coming in.
Nice twists in this story with a surprise ending. Very good.
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