You must sign in to see if this title is available for request. Sign In or Register Now
Send NetGalley books directly to your Kindle or Kindle app

To read on a Kindle or Kindle app, please add as an approved email address to receive files in your Amazon account. Click here for step-by-step instructions.
Also find your Kindle email address within your Amazon account, and enter it here.
Pub Date Jun 18 2024 | Archive Date Jul 02 2024

Talking about this book? Use #Shadowheat #NetGalley. More hashtag tips!


What happens when two serial killers begin to compete with each other?

From #1 New York Times bestselling author Meg Gardiner comes a new high-octane thriller in the acclaimed UNSUB series.

FBI Special Agent Caitlin Hendrix faces a case from nightmares.

In a Tennessee prison, Efrem Judah Goode draws haunting portraits of women he claims he has killed. Around the country, desperate families of the missing seek answers in his eerie drawings. And on darkened back roads and New York City streets, a new killer poses duct-taped bodies at the sites of Goode’s murders.

Two serial killers are locked in a twisted rivalry. To stop the brutal slayings, FBI profiler Caitlin Hendrix must unravel the connection between Goode and the Broken Heart Killer. Their warped competition destroys anyone in their path. Caught between a manipulative psychopath and a ruthless UNSUB, Caitlin has to dive into not one, but two dark and twisted minds. She will risk everything, plunging into the depths of their depraved clash to hunt down an unstoppable killer.

What happens when two serial killers begin to compete with each other?

From #1 New York Times bestselling author Meg Gardiner comes a new high-octane thriller in the acclaimed UNSUB series.

FBI Special...

A Note From the Publisher

Meg Gardiner is the critically acclaimed author of the UNSUB series and China Lake, which won the Edgar Award for Best Paperback Original and was a finalist for NPR’s 100 Best Thrillers Ever. Stephen King has said of Meg Gardiner: “This woman is as good as Michael Connelly…her novels are, simply put, the finest crime-suspense series I’ve come across in the last twenty years.” Gardiner was also recently reelected President of the Mystery Writers of America for 2019 and 2020.

Meg Gardiner is the critically acclaimed author of the UNSUB series and China Lake, which won the Edgar Award for Best Paperback Original and was a finalist for NPR’s 100 Best Thrillers Ever. Stephen...

Advance Praise

“Meg Gardiner is the next suspense superstar.”

Stephen King

“Meg Gardiner is the next suspense superstar.”

Stephen King

Marketing Plan

  • Major campaign for bestselling author Meg Gardiner
  • Prepublication buzz, outreach, and appearances
  • National features and reviews
  • National print and digital advertising campaign
  • Creative crime/thriller outreach and programming
  • Major bookseller merchandising / co-op
  • Social media, sweepstakes, and book trailers
  • High-profile author platform
  • Featured title/author at library, bookseller, and consumer trade shows and conferences

  • Major campaign for bestselling author Meg Gardiner
  • Prepublication buzz, outreach, and appearances
  • National features and reviews
  • National print and digital advertising campaign
  • Creative crime/thriller...

Available Editions

EDITION Hardcover
ISBN 9781982627522
PRICE $27.99 (USD)

Available on NetGalley

NetGalley Shelf App (EPUB)
Send to Kindle (EPUB)
Download (EPUB)

Average rating from 60 members

Featured Reviews

The incomparable Gardiner adds another novel to her UNSUB collection. FBI agent Caitlin Hendrix is dealing with a nightmare – two serial killers are trying to outdo each other in a twisted and deadly competition. Effrem Judah Goode sits in prison, drawing pictures of the women he’s claimed to have killed while their anguished families look for any clues in the pictures that will lead them to the remains of their loved ones. At the same time, another killer is leaving new victims at the site of Goode’s murders. Caitlin is left with the task of finding the connection between the two killers and must risk her own safety and sanity to stop the killings and bring some semblance of closure to the grieving families of the victims/ One of Gardiner’s best

Was this review helpful?

Great book! This book definitely got my heart pumping! It had a bit of everything! It had high suspense, action packed, murder, serial killers, revenge, blood shed, great police work, and some really crazy twists and turns! The storyline was very interesting and had me glued to my Kindle! I highly recommend reading this book as its well worth reading! Its a heart pounding page turner! Thank you Netgalley and the publisher for sharing this book with me!

Was this review helpful?

This talented author has written a page turner. This book was sent to me electronically by Netgalley for review. Thanks to the publisher and the author. Realistic characters keep this story moving quickly. Red herrings kept a me guessing. The ending is not easily discerned. Two serial killers make for a story that is unique.

Was this review helpful?

Not your typical serial killer chase novel, but a well plotted well character developed crime novel that grabs the strings and doesn't let go. I loved the research Gardiner has worked into a intricated plot. Well done. Great series

Was this review helpful?

This is a must read! The case is dark and full of suspense. I was sucked in from the beginning and read it in one sitting. I love these characters. Caitlin is so dogged and fascinating. And Sean gets better with each story. Then there's that ending! It left me sputtering and anxious for the next one. Just wow!

Was this review helpful?

Shadowheart is book for in the UNSUB series by Meg Gardiner.
I love a good police procedural plus as serial killers in the mix and I’ve got myself a date with a book.
Gardiner doesn’t disappoint with her newest addition to this fantastic series.
I was so engrossed in her writing that I almost felt like I was part of the story .
A fast moving and exciting story. Meg Gardiner is an excellent storyteller and the book flows in such a way that kept me up late at night to finish the story.
The suspense is palpable and keeps the reader flipping this pages.
This series reminds me a lot of Criminal Minds! If you enjoy the show then you’ll really enjoy this book/series.
Gardiner has written another wonderful thriller!

"I received a complimentary copy of this book. Opinions expressed in this review are completely my own."

Thank You NetGalley and Blackstone Publishing for your generosity and gifting me a copy of this
amazing eARC!

Was this review helpful?

I was given an ARC in exchange for an honest review, but I can't say I am an unbiased reviewer. Meg Gardiner is one of my favorite authors, and I was tremendously excited to read an advanced copy of her latest UNSUB novel. I stayed up all night reading it because I made the mistake of starting it just before I intended to go to bed! Let's just get this out of the way: SHADOWHEART is a GREAT thriller that was gripping, fun to read, and it's definitely one of my favorite books of the year.

This UNSUB novel brings us on another adventure with FBI Special Agent Caitlin Hendrix, Rainey, Sean, and the rest of the crew you've come to look forward to seeing in this universe. You can read the plot outline on Goodreads or Amazon, so I won't give too much detail on the story specifics. This UNSUB entry takes Caitlin into decidedly more feminine territory, which was really refreshing to read and experience. Almost all the characters in this book are women, and it's ultimately a story about mothers and daughters, and the nuances of that special bond.

Another aspect of this novel I greatly appreciated was the attention Gardiner paid to Caitlin's mental health. Caitlin has struggled with self-harm and stress overload in the past, like many other detectives in many other books and movies, but Caitlin has recognized that this behavior is both unhealthy and ineffective for herself and her work, and she is working with a doctor (I can't remember if it was a psychiatrist or psychologist) to develop healthier patterns and responses to her stressful and emotionally grueling work as a detective. Caitlin actually has a day off in this book! And takes time for herself and her little family! I almost cheered for her when she put on some Janelle Monae at the end of a long day.

I LOVED SHADOWHEART and I hope the rest of the UNSUB and Gardiner fans enjoy it as much as I did! Can't wait for the next one.

Was this review helpful?

Meg Gardiner is back with another pulsing serial killer thriller. Caitlin Hendrix, FBI agent, must make the connection between a killer in lock up and one still at large. Efrain Judah Goode murdered multiple women years ago. Now a new killer is on the loose, playing connect the dots with Goode's murders. Caitlin must look beyond her training to see how the two could know so much about each other. She races to save innocent lives from destruction as the two killers clash.

Caitlin Hendrix is such a likeable character. This series has been great to follow. Her dynamic has changed and so has her circumstances. Caitlin continues to face cases that push her to the limits. I could read this series for days. There's so many moving parts that all come together so nicely.

Thank you Netgalley for the advanced copy. I truly enjoyed reading this one way early. Now just to wait for the next one.

Was this review helpful?

When 2021 came to an end, I hopped on a call with the rest of the BTB crew, and we gave our year-end award winners, while also mentioning what books in 2022 we were most looking forward to. I had mentioned that I was looking forward to an untitled Meg Gardiner book, although there had yet to be any mention of one. As I sat down, now in 2023 to read the newest novel in her UNSUB series, Shadowheart, I was so excited.

Meg Gardiner once again absolutely crushed it. With one of my favorite book series, Meg Gardiner delivered another brilliant serial killer thriller that will leave readers gasping for breath.

When a killer, drunk out of his mind, drives his car into a police station parking lot with dead people in his backseat, Caitlin Hendrix is called in to investigate. The deeper she digs, and with the killer behind bars, she realizes there is a copycat - the Broken Heart Killer - killing people under the cover of night and dumping them in the river. The deeper Hendrix digs, the more she discovers about the killer and the copycat, racing against the clock, trying to stop the copycat before they kill another victim. On top of this, she is still trying to solve another investigation simultaneously.

Meg Gardiner once again delivers a top-of-the-line thriller with Shadowheart. One of the most intriguing and pulse-pounding novels I've read in some time, I couldn't put it down. It's one of those 'read it while you walk around the house', 'read it while you eat breakfast', 'read it during work meetings', 'read it in the washroom' type of books. It was literally hair-raising (I took a picture of the goosebumps one of the parts gave me). Gardiner is second to none when it comes to crafting a twisting and turning plot, creating lovable and hateable characters, and keeping readers locked in from page one until well after the book is over. This is a novel I will remember for a long time - Gardiner's best book to date.

Was this review helpful?

Meg Gardiner is back with a thrilling new edition to her Unsub series. Shadowheart is Gardiner at her best....gritty, raw, emotional psychological thriller that's hard to put down! It's a must read for fans.

Was this review helpful?

Thank you to the publisher, author, and NetGalley for providing me with an ARC in exchange for my honest rating and review.


This remains one of my all time favorite series. Just like the last three books, this was so so good. These books read like episodes of Criminal Minds. While reading this one, I was on the edge of my seat the entire time!! The way the author gives the readers nuggets of information that the FBI agents don’t know is sheer perfection. I very much enjoyed all of the twists and turns of this case! I’m already impatiently waiting for the next book!!

Was this review helpful?

Yes - A new book from Meg Gardiner. Shadowheart is an addition to the Unsub story.

"FBI Profiler Caitlin Hendrix is working a case with a copycat serial killer whose crimes have a connection to another killer - Effrem Goode. Caitlin must unravel the connection between the two if she has any hope in stopping the copycat."

I really like this story from Gardiner. There are lots of connections that Gardiner shows us a little at a time. But the final reveals have lots of a-ha moments. She does a great job tying things together.
There are multiple psychopaths in this story and all are terrifying.
There is a side story continued from the previous books about a character called The Ghost that is not resolved but has some interesting continuation.
There are several names to keep up with - that was my only struggle. By the time you get to the end though you'll know them all.

Great story from Gardiner.

Was this review helpful?

A new UNSUB book...sign me up! I am a big fan of this series, even though it is hard to get in Australia. I purchased the first 3 books in the series and binge read them, very sad when the last one was finished. I was thrilled to see that book 4 was coming out and I was even more excited when I was approved for an early ARC, so thank you so much to Blackstone Publishing.

It was so good to be back in Caitlin's world and the FBI BAU. Give me a book with a serial killer and I am on happy reader. Shadowheart gave me not just one sadistic murderer but multiple. Caitlin and the team are on the hunt for a copycat killer - the original killer is in prison and still denies 3 of the murders he has been put away for.

This is a faced paced, action-packed page turner. I do suggest reading the other 3 books in the series first or you will miss so much. It is dark and fairly messed up. That will make you want to keep reading well into the night like I did. An intense and satisfying read - bring on book 5

Was this review helpful?

Meg Gardiner’s UNSUB series is my favorite series of all time. I said what I said! I fell in love with this series’ dark and unapologetic storytelling—you just never know who Gardiner will axe off and it’s so creepy! I loved every installment of this series and her latest, SHADOWHEART, is no exception.

This time around, FBI Special Agent Caitlin Hendrix, is in New York City, trying to find a copycat killer who is repeating the work on a serial killer who’s been jailed since the late ‘00s. In a Tennessee prison, Efrem Judah Goode has been drawing the victims of his past in response to coming forward with their identities. At the same time, this copycat killer, nicknamed the Broken Heart Killer (you’ll find out why) is killing people in the same locations that Goode left his victims back in 2008. These two serial killers have a twisted relationship somehow and Caitlin needs to find out what it is before more people are murdered.

This book starts a bit slower than the previous Unsub novels, but once you get to about 80ish pages, you’ll be hooked. I am so tired because I read the book in one sitting. After I read the book, I double check the locks and behind the shower curtain before bed because this book seriously creeped me out. SHADOWHEART felt the most like a standalone than its predecessors because we didn’t get much insight into Caitlin’s personal life, so fans of the series may have opinions about that, but I loved it nonetheless. I hope this series continues to thrive because I can’t get enough.

Was this review helpful?

This one was a real page turner!! I haven't read the rest of the series, but that didn't slow things down for me. Each character, especially Caitlin and Finch, pull you into their lives. They make you feel everything that they do and more. Caitlin, FBI agent, on the trail of a killer that like to work in the shadows. Finch, a confused teen, who only wants to know where she came from. I hope to read the rest of this series and highly recommend this one, wish I could give it more than 5 stars!!!

Was this review helpful?

I loved this book! I read this book so quickly. The Unsub series is not for the faint of heart. I was on the edge of my seat while reading this, never knowing where Meg was going with the story.

Was this review helpful?

I love anything Meg Gardiner and the Unsub series. It always feels good to return to familiar characters and build on past books. I'm a fan forever. I'm sad that pub day is pushed back for this one, because then it will be that much longer until I can buy a copy for my shelves!

Was this review helpful?

This was a truly thrilling read.

I loved our Main Character and I was definitely all in on this story about two serial killer rivals. It was seriously creepy!

Highly suspenseful and an absolute page-turner of a read. One of those I didn’t want to put down until the very end.

I definitely want more.

• ARC via Publisher

Was this review helpful?

Thank you so much to Meg Gardiner and Blackstone Publishing for my copy of this book! I am OBSESSED with the Unsub series and I feel like I’ve been waiting FOREVER for this book to come out! This book was about serial killer Efrem Judah Goode, a man who duct taped and murdered women before he was sent to prison. Now he is drawing haunting portraits of his victims, and a copycat is remaking his work. To stop the killings, Caitlin needs to find the connection between Goode and this new killer.

Thoughts: This book starts slower than the others, but is just as good. The story is complex and interesting and still has the underlying search for the Ghost. There were multiple perspectives in this story, as well as multiple psychopaths. The negative is that the reader gets a lot less of Caitlin than in the past, and a lot more of other characters. I wish she had been more of a focus, as well as a bit more of past storylines.

This book almost felt like a stand alone, and could definitely be read as one. I also didn’t notice a case that this book mimicked, so that was interesting as well. There was a lot of travel time in the book that broke up the fast paced tension, but besides that, this was another amazing hit! 4.5 stars for this wonderful book!

Was this review helpful?

UNSUB was my quarantine obsession and I audibly squealed when I saw that the series was continuing. With cliffhanger after cliffhanger, this book is so hard to put down. (Me literally sneaking peeks at it during Sunday brunch). Between following the investigation of a prolific serial killer's cold cases and the appearance of a copycat killer? The thrills are impeccable.

And the TWISTS!! While I saw a handful of them coming, I was blindsided several times. And in a thriller, I absolutely looooove that. I don't know if I'll ever be tired of Caitlin Hendrix to be honest, but Book 5 may be a natural ending point for this series. Because god damn, Ghost deserves a book of his own.

*Thank you to Blackstone Publishing and NetGalley for an ARC in exchange for my honest review*

Was this review helpful?

A dark and riveting blend of true-crime with thriller elements led by a formidable protagonist you’d want watching your back. Meg Gardiner continues to reign over the dark genre of crime thrillers.

Was this review helpful?

Reading Shadowheart is not for the faint of heart. Expect frayed nerves, heart palpitations, a daisy chain of gut punches, sweating the ending and yelling at characters who can’t hear you. It’s a thriller that causes a reaction you feel throughout your body. Brilliant and chilling stuff from the marvelous Meg Gardiner.

FBI Special Agent Caitlin Hendrix is on the hunt to stop the Broken Heart Killer. This serial killer appears to be a copycat of Efrem Judah Goode, a man convicted of multiple murders and serving time in a Tennessee maximum security prison. The crimes and locations are very similar to the point where Hendrix wonders if there’s a connection and communication between the two. And she’s tasked with a clear mission – find the connection, stop the killings. Caught between a devious psychopath and a vicious UNSUB, this case will be anything but easy. But Hendrix will stop at nothing and risk everything to solve the case, hunt down the killer and put an end to the mayhem they have wrought.

The UNSUB novels constitute the best serial killer series in print today. Combining tremendous pacing with storytelling that will scare the ever-loving crap out of you – and featuring terrifying psychopathic killers that will cause you to have your head on a swivel anytime you leave the house – they will have you frightened of the dark and lead to questioning your sanity anytime you’re walking alone at night.

Shadowheart fits this to a T and is a superb continuation of the series after a three-year hiatus. Caitlin Hendrix continues to grow and evolve as a character while exhibiting incredible intellect and drive to relentlessly pursue and thwart a prodigious murderer. The plot is fantastic with The Silence of the Lambs vibes. Goode the Hannibal Lecter to Hendrix’s Clarise, the law enforcement officer needing the insight of a jailed sociopath convict to track down the new serial killer. And it works incredibly well, moving at the speed of light with tensions ratcheting up every single page until it explodes like a shotgun blast. It’s simply fantastic.

Meg Gardiner is an incredible writer and her talents are on full display in the remarkable Shadowheart. Don’t miss this book…but don’t read it in the dark. You have been warned.

Was this review helpful?

Quite honestly, I DID NOT WANT THIS BOOK TO END. It is so fabulously written by Ms. Gardiner... and Shadowheart featuring FBI Special Agent Caitlin Hendrix picks up very close to when the previous book left off. In addition to chasing the Ghost, Caitlin and her incredibly talented team are drawn into the life of convicted serial killer, Efrem Judah Goode. He's drawing pictures of his victims and leading the FBI on a chase to try to determine the identities of the women in his drawings. To compound this, a copycat killer is recreating Goode's kills and leaving a broken heart drawing at their body drops. As Caitlin digs deeper, the entire case seems to circle around a girl named, Finch, who believes her Mom was one of Goode's initial victims. Absolutely one of my favorite books of the year! And the ending... WOWZA! Thank you to Blackstone Publishing for an advanced reader of this book - the opinions expressed are my own.

Was this review helpful?

Thanks to #NetGalley and #BlackstonePublishing for the book #ShadowHeart by #MegGardiner. This book, the fourth installment in the Unsub series, is absolutely phenomenal. Caitlin is after another serial killer, or a copy cat killer-Broken Heart Killer. It’s pack full of chasing, murders and drama and I cannot wait for the next book!

Was this review helpful?

Readers who liked this book also liked: