Magnitude

by Jennifer A. Nielsen

From the #1 New York Times bestselling author of Iceberg and The Free State of Jax comes the harrowing story of the fight for survival during the Great San Francisco Earthquake of 1906 and the desperate race to find survivors.San Francisco, 1906.When Cora leaves her house in the early morning hours of April 18th, she expects trouble to find her, like it somehow always does. But as she makes her way to the San Francisco docks to look for her father, the earth begins to shake and suddenly, Cora realizes that she's not just in trouble--she's in danger.Soon after, the last thing Cora remembers seeing is a tall building swaying overhead, before everything goes dark.When Cora wakes up, she's trapped underground with Chi, whom she met by accident on the way to the docks. They're running short on air and time, when miraculously, Cora's friend Oliver pulls them from the rubble. Once she's above ground again, Cora is shocked to find herself in a city that has been decimated by a massive earthquake.Together, Cora, Chi, and Oliver begin a desperate search for their families, all the while trying to evade terrifying fires that are tearing through the wreckage and a gang of thieves who are pursuing Cora and a valuable secret she holds.From beloved #1 New York Times bestselling author Jennifer A. Nielsen comes a thrilling, suspenseful story about courage, friendship, and the strength it takes to survive one of the most terrible natural disasters this country has ever seen.

Genres: Historical Fiction, Middle Grade, Adventure, Childrens, Young Adult, Survival

274 pages, Kindle Edition

First published March 3, 2026

About the author

Jennifer lives at the base of a very tall mountain in Northern Utah with her husband, three children, and a naughty puppy. She loves the smell of rainy days, hot chocolate, and old books, preferably all at once. She is a former speech teacher, theater director, and enjoyed a brief but disastrous career as a door-to-door pollster. In her spare time, Jennifer tends to panic, wondering what she has forgotten to do that has allowed her any spare time.

Reviews

[TL *Humaning the Best She Can* · Rating 4 out of 5]

She's really good at making her characters and settings come alive and feel like you could reach out and touch them and step outside the door and see everything they see.

I can't imagine the fear and the chaos during and after this huge event 💔😢. So many losing everything and some happily finding each other.

And others taking advantage to loot from the rubble 😠.

But there was also brave,kind, and selfless people as well.

It's amazing the city was able to be rebuilt.. would love to read fiction and nonfiction books about rebuilding after the earthquake.

[Rebecca · Rating 3 out of 5]

Writing about a disaster requires a special set of writing skills, foremost among them the dual ability to make the characters have a stake that's not entirely related to the disaster itself. Nielsen did this beautifully in her book Iceberg (about the Titanic), but it doesn't quite work as well here. In large part, this is because we simply don't get quite enough information about the Great San Francisco Earthquake of 1906. There are headings at the start of each chapter charting first the quake and then the progress of the fires, and bits of information about the way the Chinese community was treated and the corrupt city government are present, but they don't intertwine with Cora's story quite as well as they might have - and the historical note in the back doesn't really give readers any resources or additional information.

Still, the basic story and writing are good. Nielsen does a solid job of depicting Cora's moral dilemmas and if the plot about the rift between her family and her best friend Oliver's isn't as developed as it could be, it's still a good backdrop for the other issues she faces. Chi is the least developed character in the book, and since she's also the only nonwhite character, that's a problem; I really would have liked to see a bit more go into her other than "People in 1906 learn that Asians are human too."

I think I would still recommend Outrun the Moon to a middle grade audience looking for a book about the earthquake, but that doesn't mean that this one isn't worth reading. Rather it's the book you pick up when you already know the basic history and want a story in that time and place, not the one you pick up to learn about it in the first place.

[Avi · Rating 2 out of 5]

I'd say 2.5 stars. There were some parts I liked and others that did not seem realistic at all...

[Marinda (rindasreads) · Rating 5 out of 5]

Jennifer A. Nielsen has done it again--taken me to a historical setting I know only a little about and plopped me into the middle of an action-packed adventure with high stakes and lovable characters. Cora, Chi, and Oliver felt like family by the time I finished reading about their story, which takes place during the Great San Francisco Earthquake in 1906.

This is one of those stories that has you cringing at the character's choices, were you think things can't possibly get worse and then they do, but somehow it all turns out okay. Choices are made with real consequences--both good and bad. I love that I can hand this novel to my children and know they're getting a dose of history along with ethics.

Thank you to NetGalley and the Publisher for sending me an advanced ecopy to review! All opinions are my own.

[Wendy · Rating 5 out of 5]

Thank you to Netgalley for giving me a ARC of this book. This was my very first Jennifer A. Nielsen book and I flew through it. I really enjoyed the nonstop plot, the chaos our main character deals with throughout and how everything is resolved. I truly enjoyed how the author how all people are important and how they all share in the destruction and the shock of the earthquake too. I am looking forward to adding more books from this author on my TBR. Great read!

[Sheri · Rating 4 out of 5]

Loved this one. Couldn’t put it down. Four stars because some of the history was not on point. Including the dust cover. Still worth the read.

[Teagan · Rating 5 out of 5]

Magnitude

Author: Jennifer A. Nielsen

Category: Middle grade, Historical fiction, Young Adult

Cupcake Rating: 🧁🧁🧁🧁🧁

Magnitude is scheduled to be published on March 3, 2026

Magnitude is a historical fiction chapter book. Magnitude tells a story about a girl named Cora and her family in the early 1900's that experience the Great San Francisco earthquake. Cora's family was very poor, due to their gold mine shutting down. So Cora's dad had to sail away from San Francisco to find a better job. Every morning Cora would walk to the dock to see if her dad was home... she couldn't give up. One day while she was walking to the dock an unexpected earthquake started. This earthquake was like nothing she had dealt with before. When a building falls on her and she is trapped she needs to find a way out. Will she survive? Will she find her family? Will her friends be safe? Netgalley sent me this book early for review purposes and I was very excited. Thank you Netgalley! I had just read A Night Divided and loved it, and when I received Magnitude, I was in the middle of reading Iceberg by the same author. Magnitude is a very detailed and INTENSE book, I loved it so much that I read it in two days. Every page has a new and interesting thing happening. Magnitude has good character development and the plotline kept me on the edge of my seat at all times! The book is intense, but not gory and it is totally clean. A good book for those who love to read mid grade novels. I think everyone should read this book! Grab a copy for yourself and enjoy the ride! I give this book a 🧁🧁🧁🧁🧁 review, IT WAS AMAZING!

[Erlene · Rating 4 out of 5]

I recently finished Magnitude by Jennifer A. Nielsen, and it was such a powerful read. I really appreciate how she brings different historical events and time periods to life in a way that feels real and personal. This one is set during the Great San Francisco Earthquake of 1906, and you can truly feel the chaos and fear through Cora’s eyes. Cora is the kind of main character who is always finding (or getting into!) trouble, but that’s what makes her so compelling. She’s brave, stubborn, and constantly learning who she can trust. One part that really stood out to me was the mention of the “special police.” Since they wore regular clothes, you couldn’t always tell if someone was pretending to have authority, which honestly reminded me of some modern issues with ICE and how complicated enforcement and identity can feel today.

The book doesn’t shy away from showing how awful people can become during disasters, especially when corruption and fear take over. It also touches on racism in the Chinatown area and the unfair assumptions people made during that time. At the same time, the story beautifully explores friendship: the complexities of it and the incredible power it has even in the hardest moments. Perseverance is a strong theme throughout, as Cora keeps pushing forward no matter what’s thrown at her. It’s a great mix of action, history, and heart. It’s a great read, and I definitely recommend it. I will be purchasing it for my school library.

[Susan Lefman · Rating 5 out of 5]

Magnitude by Jennifer A. Nielsen (Mar 3, 2026)
ARC provided by NetGalley

Jennifer A. Nielsen takes readers back to April 1906, San Francisco, on the eve of the devastating earthquake. Cora lives with her mother and siblings in crowded tenements, anxiously awaiting the return of her father, who left to find work after the family gold mine closed. On her way to the pier in hopes of spotting him, Cora encounters Chi (Zhi), who is fighting to keep hold of her bicycle from Vincent and Tony Jr.—two boys Cora knows all too well.

Cora steps in to help, and together she and Chi escape—only for the earth to suddenly split beneath them. The girls plunge into a crevice as buildings collapse around them. They’re later rescued by Oliver, whose family once shared a close bond with Cora’s before time and circumstances fractured that connection.

From there, the trio face a series of perilous challenges amid aftershocks, fires, and destruction, uncertain if they’ll ever make it home to their families.

As in most of Nielsen’s novels, readers will be gripped from the very first page and held fast until the end. Chapters marked with times and dates mirror the relentless rumbling and chaos spreading through San Francisco, heightening both the tension and the atmosphere.

A powerful, fast-paced survival story—highly recommended for upper elementary and middle grade readers.

[Connie · Rating 3 out of 5]

The great San Francisco earthquake in 1906 was the focus of this middle grade book. Nielsen writes from a young girl’s perspective, who has been traipsing all around the city, avoiding the street gang who is after her and looking out for her father who could return home any day now. Cora finds herself down by the docks when the earthquake hits, and is sucked down a hole, along with Chi, her new friend who is Chinese American. The other piece to this story is Oliver, the boy who’s family used to be good friends with Cora’s but had a falling out over a mine dispute.
This is one book where I really wish I could rate in half stars as this is a solid 3.5 star read for me. The topic was interesting, but the delivery could have been less choppy and repetitive. This beginning was an immediate attention grabber, and the ending sped forward at breakneck speed, however the middle of the book lagged without the same tension. I also don’t feel that the timeline at the beginning of each chapter was helpful, especially since nothing in the chapter eluded back to the chapter heading and it created a choppiness to the story. A map of the city would have been more helpful. On the good side, this was a much needed historical fiction book for middle grade readers and I did enjoy learning about the aftermath of the earthquake. Recommended for upper elementary and middle school readers.

[Darla · Rating 4 out of 5]

The San Francisco Earthquake is a siginificant event in our nation's history. I was thrilled to discover that Jennifer A. Nielsen had a new book coming out about the event.

What was it like to live through those catastrophic days in 1906?

Here are some things I really appreciated about this upcoming title:

👧Cora Henshaw is our narrator. She is a scrappy heroine who is not afraid to get her hands dirty. There was a bit too much made of her astrological sign, but she did use her head to think about overcoming the obstacles in her way.

👦Oliver Brennan is an old friend and he provides needed support for Cora in the aftermath of the earthquake. Their families have been feuding so the relationship is complicated and adds to their distress.

🐉The Chinatown population was also deeply affected by the earthquake in addition to the racial strife in the city. Nielsen gives us some insight into how the conflict would have played out before and after the disaster.

📕This is one action-filled story. Cora and Oliver both face real moments of peril and must think quickly. I found myself wondering what I would do if faced with their dilemmas.

Readers who enjoy the I Survived series by Lauren Tarshis will also want to check out these disaters stories by Jennifer A. Nielsen. Thank you to Scholastic Press and Edelweiss+ for a DRC in exchange for an honest review.

[KidsBookPick · Rating 4 out of 5]

I went into this book knowing very little about the San Francisco fires, and I loved how it inspired me to look up more about that period in history. The opening chapters were especially interesting to me. I could have spent even more time underground with the girls! I also liked the unique chapter titles noting which parts of the city were burning and at what times. One of my favorite aspects was the cross-cultural friendship that formed despite the societal barriers of the time.

On the other hand, the group of antagonist boys didn’t work as well for me. They felt a bit contrived and appeared so frequently that their presence started to pull me out of the interesting historical fiction part of the story. I understand they were meant to add tension beyond the fires themselves, but their role felt overplayed.

I always enjoy Jennifer A. Nielsen’s writing, and while this wasn’t my favorite of her books, it’s still a solid read. The topic may have made it harder to write a fast moving plot, but the historical details and themes of resilience and friendship make it well worth reading for fans of historical fiction.

I was provided an ARC from NetGalley in exchange for my honest review.

[Adrienne · Rating 4 out of 5]

This book has a lot going on--Cora, Zhi, and Oliver all dealing with the earthquake and looking for/worrying about their families; Cora trying to get away from a couple of gang members who she owes money to, Cora and Oliver trying to sort out their friendship when their families are at odds, etc.--and it didn't all come together quite as cleanly as I would've liked. I really liked the historical details woven into the story--from the way the fire was handled (such as dynamiting building to try to create firebreaks and the prejudices against the people in Chinatown), but I felt like the whole element with Cora owing money to some boys who are constantly trying to track her down fell a little flat; the villains were just stock characters and that whole plot element didn't add that much to the book; I think it could have been removed and the book wouldn't really have lost anything because the other elements could have been developed more and made a cohesive, engaging story. That said, I will definitely still be snagging this for my kids to read because I'm sure they'll enjoy the story and the historical details.

I read a DRC provided by the publisher via NetGalley. All opinions are my own.

[Suzy · Rating 4 out of 5]

Have you ever wondered what it was like to live through the earthquake of San Francisco in 1906? Having grown up in California and lived through many earthquakes, it is always interesting to learn more.

Cora is on her way to search the docks for her father when the earthquake hits. She meets a Chinese girl going the same direction and the adventures/horrors begin. As they fight for their lives under the ground, and then above, they both learn about tolerance, friendship, and loyalty. Oliver is an old friend of Cora's , but their parents have had a falling out. He helps in the rescue of the girls, and continues to assist as things go from bad to worse.

During this story we see government officials making decision that feel wrong, like a shoot to kill order on al looters, and other governments officials with understanding and empathy.

As a fan of Jennifer A Nielsen, I am excited to share this book with my Elementary Students!

Thank you to netgalley and scholastic for an early copy to read and leave an honest review.

[Allison Haehnel · Rating 5 out of 5]

Thank you to NetGalley and Scholastic Press for the digital ARC of Magnitude. This was the first book I have read by Jennifer A. Nielsen. She has a wonderful narrative style for middle-grade readers. "Magnitude" tells the story of Cora, Oliver, and Chi as they navigate San Francisco after a strong earthquake in 1906 that started fires and demolished buildings. The devastation isn't the only risk for these three. Cora owed money to boys who loaned her money from a surprisingly unscrupulous city leader. Many times, their greedy hands proved to be more dangerous than the city's terrain after the quake. Junior high students will appreciate Ms. Nielsen's novel if they are previous fans of the "I Survived" series and are looking for a new challenge. I highly recommend this for girls due to the brave female protagonist, historical fiction fans, and those who want to know more about immigrant experiences at the turn of the 20th century.

[Diana of Shelved by Strand · Rating 5 out of 5]

Jennifer Nielsen delivers another hit historical fiction novel with Magnitude, the story of three kids caught in the 1906 San Francisco earthquake. Growing up in California, I’ve known about the quake all my life, yet this is the first middle-grade book I’ve read that shares so many details in a way that’s accessible for younger readers. The story never gets lost in the history, though. Middle-grade readers will find Cora’s story a true page-turner, staying on the edge of their seats as they hope things turn out for her and her friends, Oliver and Chi.

I’ve already preordered this for the historical fiction fans in my middle school classroom and can wholeheartedly recommend it for other Christian school libraries as well. Cora makes some questionable choices, but she wrestles with her conscience as she tries to care for her family. No language or other content warnings.

Many thanks to NetGalley and Scholastic for the eARC in exchange for my honest review.

[Jessie Otto · Rating 4 out of 5]

Magnitude fits right in with the other historical novels by Jennifer A. Nielsen. She is one of my favorite middle grade authors. This story is about the San Francisco earthquake of 1906 and the fires that resulted. I enjoyed this book with themes of friendship, family, and honesty, and thought it was mostly fast paced getting into the action quickly. I will be recommending it to my 4th and 5th grade students. I thought the middle of the book became a bit repetitive with similar events happening multiple times, and similar language or the same phrases used near each other. My favorite book of hers is still A Night Divided, but I do think middle grade students who like historical fiction or her other novels will also enjoy this one. I am excited to have received this as an advanced copy from Net Galley! I give this book 3.5 stars.

[Stephanie · Rating 4 out of 5]

This book falls into step with Jennifer Nielsen's other middle grade historical fiction books. My son, in sixth grade, and I read many of her books over the summer and this one is top notch. She blends the accuracy of event of the Great Chicago Fire with the humanity of a young person experiencing it. I recommend this book to some of my older fourth graders who have an interest in history and love suspenseful books.

My favorite Jennifer Nielsen book is A Night Divided, but I love how she crafts the storytelling of Cora and the monumental she endured. The friendship between Cora, Oliver, and Zhi is a great aspect to include in middle grade fiction.

Like most of Jennifer Nielsen's book I would want to make sure that my students are mature enough to handle reading about traumatic events and natural disasters, but overall I would highly recommend this book.

[Middle Grade Mama · Rating 4 out of 5]

Set in 1906, Magnitude takes us through the horrific San Francisco earthquake and its aftermath. As Cora tries to find her family, she has to navigate a crumbling city plagued with fires, looting, and corruption. In the midst of never-ending suspense, she finds extreme courage and powerful friendships.

I once heard Jennifer Nielsen say that a coming theme in her books is "danger." And this book definitely fits the bill. I love that this book does such a good job of teaching us about the time period while also telling a great story with dynamic characters. I learned so much and I found myself really rooting for Cora and her friends. I can't wait for more readers to get their hands on this book.

[Kate Goforth · Rating 5 out of 5]

"The earthquake didn't care where we had come from. We all shared in the destruction. So we can all share in the shock of it too."

Magnitude by Jennifer A. Nielsen is a well-written historical fiction novel for a middle-grade audience (but can be enjoyed by any age). This story is filled with themes of friendship, reconciliation, and standing up for what is right, even when it hurts. Although this novel explores some heavy themes and events, it will leave you satisfied and happy.

Content warnings: violence, mild-ish wounds, natural disaster, and theft (but it is righted...mostly).

Note: I received an eARC copy of this book from the publisher on NetGalley in exchange for a review.

[Yapha · Rating 4 out of 5]

A look at the immediate aftermath of the 1906 San Francisco earthquake for a variety of the residents of the city as told from the point of view of young teen Cora and her two friends. There is a lot of action and adventure starting with Cora falling into a crack in the earth that opens up due to the quake. The fires, the mismanagement, and the general destruction provide a gripping story as Cora works to make sure that everyone she cares about is safe. Recommended for grades 4 and up. For more on the Chinese-American perspective, see Outrun the Moon by Stacey Lee.

eARC provided by publisher via Edelweiss

[H. Woodward · Rating 4 out of 5]

I would 100% teach this if I was in a middle school classroom. There’s a ton of connections to classroom content, particularly for US history: Gold Rush, Chinese exclusion, effects of poverty, natural disasters, martial law.., this is sure to be a winner for teachers and students. Also, great lessons about friendship, resilience, and forgiveness. The best part is there’s a female main character with a strong supporting male character and no romance. Imagine, a boy and a girl just being friends! Thank goodness for this refreshing read!

[Kristin- Kristin's Bookstack · Rating 4 out of 5]

Jennifer A. Nielsen is one of my favorite middle-grade authors! This story had great storytelling, lots of adventure, and detailed descriptions of the devastation and destruction caused by the earthquake. The story was told with such feeling that I felt like I was going through the experience alongside the characters. I liked the friendship between Cora, Oliver, and Chi. It showed how accepting youth are and how prejudiced adults can be. I liked that the story had an uplifting ending.

Thank you NetGalley and Scholastic for the ARC in exchange for my honest review!

[Patti Sabik · Rating 4 out of 5]

Another winner from Jennifer Nielsen! I was familiar with San Francisco’s Chinatown and the plagues from reading Choldenko’s “Chasing Secrets.” Magnitude” expanded on that and brought the horror of earthquakes and fires to a visceral level. I was glued to my couch wanting to know what happened to Cora, Chi, and Oliver. It was a great story with unexpected twists, interesting history trivia, and lasting friendships.

[Tonya]

How do you find your family when your world has crumbled? In Jennifer A. Nielsen's historical novel, Magnitude, this question becomes a desperate reality. Set during the catastrophic 1906 San Francisco earthquake, the story follows three friends who must survive not only the powerful aftershocks but also the chaos of city-wide curfews and dangerous looters. It is a gripping tale of courage, friendship, and perseverance that fans of Nielsen's work will not want to miss.

[Paula · Rating 4 out of 5]

Jennifer Nielsen is a master at crafting page turning novels that leave many chapters with cliffhangers. She's such an engaging author for middle grade/middle school readers. Even reluctant readers enjoy the historical fiction/survival/adventure stories she creates. Her characters are often young teens thrust into dangerous events and must think their way through each perilous situations. Fun read and made me want to learn more about the San Francisco earthquake of 1906.

[Nora Levingston · Rating 5 out of 5]

Cora finds herself in the middle of San Francisco’s worst natural disaster. The 1906 San Francisco Earthquake. Cora and her friends set off in the search for their families. With rising threats such as the order to kill any looters and the deadly fires will Cora make it out alive? Will she and her friends find their families? Will Cora survive the deadliest challenge of her life?

[Amy Toney · Rating 4 out of 5]

Middle grade historical fiction about the San Francisco earthquake of 1906. This book is full of adventure & offers insight into a major historical event for kids through the eyes of 3 young people who help each other on this very difficult day in history. A great blend of well-researched historical fact & relatable characters.

[The Humorous Bookworm · Rating 4 out of 5]

This was wonderful! It was exquisitely written and had so much intrigue, just like all of Jennifer's stories. Magnitude was an incredible, awe-inspiring chronicle about friendship, tragedy, and the resilience of the human spirit.
Another great work from Jennifer Nielsen!

[Natalie · Rating 4 out of 5]

I liked the twists and turns of it all. The ending seemed rushed, but I loved the outcome.