McMahon’s first novel of a new series featuring a group of brilliant eccentric FBI agents that have been formed into an elite force because they have each screwed up in previous roles. Great twisting plot line, lots of action, and nice villains both external in internal. Well worth the read of this crime thriller. It’ll be a best seller for sure.

FBI Agent Gardner Camden isn’t your typical agent. His analytical ability to solve complex puzzles makes him a unique member of the FBI's Patterns and Recognition (PAR) unit, which specializes in solving cold cases.
When the unit is faced with two recent murder victims with DNA linked to a serial killer who is no longer living, Gardner and his team are faced with their most complex puzzle yet. The team must hit the road and seek whatever help they can from the public.
As the team moves ahead in the investigation, they face more riddles and stumbling blocks. Their search for the killer becomes more desperate when they learn that the perpetrator has inside access to PAR, and now their families may also be in danger.
It is an edge-of-the-seat thriller with twists and turns until the last chapter.

Head Cases by John McMahon

This was an interesting thriller following FBI agents trying to take down a killer who targets serial killers. This was a look into the FBI and was uniquely written to follow the procedural tasks following the research of grisly murders!

I enjoyed this book but found I was bored with the characters, I feel like crime thriller readers would find this exceptionally intriguing and would enjoy this thoroughly.

Thank you Netgalley and ST Martins press for this ARC.

Review of Uncorrected Digital Galley

Working in the Patterns and Recognition [PAR] group, FBI Agent Gardner Camden and his partner, Cassie Pardo, investigate when a serial killer is found murdered. Since he’d supposedly be killed more than a decade ago, everything the agents believed they knew was now suspect.

And then there’s another body. And the murderer has left riddles behind, taunting the agents.

Can Gardner with his eidetic memory untangle the clues and track down the mastermind behind the murders?

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This fast-paced crime thriller pulls readers into the telling of the tale from the outset. Strong, interesting characters, an intriguing case, and unexpected twists and turns all work together to keep those pages turning as fast as possible.

Since all four of the agents in the PAR group were sent there after making what might be career-ending mistakes, it’s easy for readers to root for the “misfit underdogs” trying to solve the case and perhaps salvage careers. As for the mastermind criminal, intent on dishing out his own form of “justice,” he always seems to be one step ahead, learning more and more about the team, adding a layer of uncertainty and apprehension to the investigation.

Readers who enjoy crime thrillers will find much to appreciate here.

Highly recommended.

I received a free copy of this eBook from St. Martin’s Press / Minotaur Books and NetGalley
#HeadCases #NetGalley

Wow; this book was great.

This is my first book by this author, but it will not be my last. I was pulled into the story immediately, and I didn't want to put it down. There were so many twists and turns, some more shocking than others.

I really liked the entire PAR team, and all of the characters seemed well developed. I also liked the backstory of the antagonist(s).

This was a very satisfying story, and Gardner was a great mind to experience the FBI through.

Thanks to Net Galley for the book to review.

This was a really great find, and I’ll be going back to find the author’s other books. Gardner Camden is part of an investigative group within the FBI, all part-brilliant, part-screwups. I liked the multi-layered case and the personalities of the agents.

(4.5) Wow!! This was such a good page turner. I got an email promoting this book with a link to download and was sold immediately. It's like criminal minds in written form with a character that reminded me a lot of Reid, which is just amazing. I absolutely loved this and I am so glad to see it's going to be a series. Agent Camden is such a fresh, unique character in a world with lots of fictional cop and agent main characters. He is wicked smart, with an insane amount of knowledge with so many different challenges and things to balance. Because we read from his POV, it made for a really interesting written voice. I can’t wait to get to know more about him and read more about the PAR team.

Thank you so much Minotaur for the early access.

I really enjoyed this book. Very fast paced and it draws you in from the beginning. The characters are "misfits" that are extremely likeable, and have you cheering for them. Very well thought out with twists and turns, and a good puzzle to try and solve. The author did a great job with a neurodivergent character, with explaining the thought processes, and the wonderful things his mother did to help raise him. I will definitely be checking out the other books my this author.

Thank you to NetGalley and St. Martin's Press for gifting me this ARC in exchange for my honest reviews.

This was my first book by John McMahon, and I’m so glad to have discovered him. I loved this book and flew through it. I enjoyed all the twists and turns, and I couldn’t put the book down. Although I’m not always thrilled to read about serial killers, I liked watching how the cases were investigated and solved. Many thanks to the publisher and Netgalley for letting me read an advance copy of the book. I plan to read his previous books and look forward to more. Highly recommended!

This is a really fun police/FBI procedural. Think Criminal Minds with a touch of Monk mixed in for some humor. While it doesn’t re-write the genre, the clever hook of a group of misfit puzzle solvers who take the cases no one else can crack is quite refreshing and makes for a great read.

I don't usually read political or military thrillers but this one was exceptional as it's fast-paced and allows the reader to see into the world of espionage and the FBI. Gardner Camden is an agent in Texas who begins investigating a "serial killer murdering serial killers." But there are so many odd things about these cases: none of them are killed in "traditional" ways, odd things are found in the dead bodies, and none of the victims seem to be related to each other. But Camden is a smart one as he pieces together all of the crazy clues that make no sense, traversing the states to pursue a man--or men--who use poisoned arrows--and leave no other trace!
Thanks to NetGalley for this ARC!

This was absolutely perfect. Every time I read a crime novel I walk away feeling smarter. This one was no exception!

A quick and compelling read. Gardner Camden is very direct with his co-workers and himself. This sometimes made it difficult to understand the dynamics of his relationship with his ex-wife and his daughter. This book has the making of a series, with each character deserving of further development and backstory. The serial killer is not obvious, and takes the role of a side character at times. I would readily recommend this to fans of Steve Cavanagh and Jeffrey Deaver.

Review: Overall, I really enjoyed this. It made me think of an adult version of Naturals by Jennifer Lynn Barnes, one of my favorite series. I really appreciated how we got to know Gardner throughout the book, and honestly how it felt like he got to know himself too. I thought the mystery part of it was incredibly well done and there were multiple times that I thought I knew who had done what and I did not. I found myself really at about 80% in really hoping that this would be a series because I liked the relationships and dynamics between the PAR team members so much and I'm really excited to see that the author is contracted for at least one more book. Definitely worth picking this one up!

Synopsis: Gardner Camden is a walking analytical brain with an affinity for riddles, puzzles, and codes. It makes him the perfect fit for the Patterns and Recognition (PAR) unit of the FBI, a team of five brilliant but misfit agents tasked with solving cold cases. Gardner's smart, but he's all business--except for his seven-year-old daughter and occasional visits to his elderly mother, he prioritizes his work and justice over everything else, no matter the cost. With rumors of PAR about to be disbanded, the team can’t afford to make any mistakes.

A serial killer from one of Gardner’s solved cases, presumed to be dead for over a decade, is found murdered, and then soon after, another body with a similar story. The mastermind murderer has left clues and riddles for Gardner and his team--a mathematician, a sniper and weapons expert, a computer analytics specialist, and their leader, a career agent--as they track him across the country. With the threat of PAR dissolving, Gardner must work to solve the riddles before it’s too late.

Head Cases is a must read for fans of crime thrillers! This was a very exciting book, with no filler or slow parts. I was engaged the whole way through. Camden was a great main character, and I liked the whole PAR team of misfits. I definitely got Criminal Minds vibes, so I think fans of the show will love this book. The case is interesting, and I enjoyed the clues and the twists and turns. I was thrilled to see that there will at least be a second book, and I hope that it becomes a series. I would love to get to know the rest of the team better and see them use their skill sets more in the next book. I have never read anything by John McMahon before and I can't wait to see what else he has written. I highly recommend this book!

Thank you NetGalley and St. Martin's Press for the ARC!

I couldn’t put Head Cases by John McMahon down at all and finished this wonderful book in one day. Head Cases is a fast paced cat and mouse story about a group of misfit FBI agents that work on cold cases. All three of them were sent to this department known as PAR after they’d made mistakes in their careers. Gardner Camden is the lead agent on the newest case involving serial killers that are being murdered. These agents are working against the clock to solve this case and it may be the last case for the team. I can’t wait for the next book that John McMahon has up his sleeve to follow up Head Cases. I would like to thank both NetGalley and Minotaur Publishing for letting me read an advanced copy of the novel.

I didn’t expect this review to be so hard to write - such mixed feelings about Head Cases. There were parts I liked and would recommend it to those who like criminal mysteries. I wish there was more suspense and angst. Most questions were answered almost immediately and didn’t leave the reader must time to draw their own conclusions.
I did enjoy getting to know the FBI agents in the Patterns and Recognition (PAR) unit. Each agent brought quirky personality traits to the group, and these traits helped solve cases. While this wasn’t my favorite mystery, I would recommend it and I plan to read the next book in the series to see how this group of misfits continue to meld. This book can be read as a standalone, as the primary case to solved.

5 stars. Given the state of my Netgalley queue, I had no business reading Head Cases in October, when it releases in January. But there was just something about that blurb that called to me. And as soon as I received the widget in my email, I hit download. And then, Head Cases jumped to the top of my queue and became my next read book. Now having read Head Cases, I can say with 100% certainty that bumping this baby to the top of my TBR was categorically the right decision. Because damn, this book was SO GOOD.

Head Cases is kind of like a combination of the Criminal Minds TV show and The Suicide Squad movie. Which turns out to really work for me, because now I want to read this combo again and again. At the FBI, the four members of the PAR unit are jokingly (but not really jokingly) called the Head Cases, and probably not just because they have a good head for solving difficult cases. But, that also is true. And while they're not the villains (as is the case with the Suicide Squad movies), they ARE all misfits. All of the members of the team come with their own tale of woe involving a political screw up that finds them assigned to the PAR unit. PAR are "the little guys." They don't have the same resources that the rest of the FBI have, are located in a satellite office, and are never... NEVER given any field assignments. But the thing about this Head Cases division is that they close cases, including those that no one else can close. But things at PAR are changing. Just as rumors start to circulate that PAR is being shut down, the FBI's top academy recruit gets added to their team AND they get assigned a case with actual field work. And oh yeah, one of the members of the team gets bumped to the position of lead. The book is told entirely from Gardner Camden's POV and character-wise, he's like a combination between Hotch and Spencer from Criminal Minds. He's got the pattern recognition abilities of Spencer, with the sterile/ monastic/ by the book personality of Hotch. And this case he and PAR are assigned to turns out to be a serial killer hunting serial killers. Each member of the PAR team has their own "super power, " and without a doubt, my favorite part of this book were the members of PAR. I loved how their skill sets complemented one another, I loved how they found clues no one else could, and I loved how they were all unapologetically themselves... for good or for bad.

If you check out the acknowledgements, you'll see that Head Cases is part of a 2 book deal, which means that we are 100% getting a sequel. This is something I'm VERY excited about. When I tell you, I binged the HELL out of this book. I could not put it down and stayed up late to read it. And I cannot remember the last time I've done that with a book.

Thank you so much to McMahon, Minotaur, and netgalley for the ARC in exchange for the honest review. I'm going to need everyone to read this book, that way Minotaur decides to turn this into a multi-book series, and not just a duology.

𝙱𝚕𝚞𝚛𝚋:

•ꜰʙɪ ᴀɢᴇɴᴛ ɢᴀʀᴅɴᴇʀ ᴄᴀᴍᴅᴇɴ, ᴀ ᴘᴜᴢᴢʟᴇ-ʟᴏᴠɪɴɢ ᴀɴᴀʟʏᴛɪᴄᴀʟ ɢᴇɴɪᴜs, sᴛʀᴜɢɢʟᴇs ᴡɪᴛʜ ᴛʜᴇ ʜᴜᴍᴀɴ sɪᴅᴇ ᴏꜰ ɪɴᴠᴇsᴛɪɢᴀᴛɪᴏɴs, ɪɴᴄʟᴜᴅɪɴɢ ʜɪs ʀᴇʟᴀᴛɪᴏɴsʜɪᴘ ᴡɪᴛʜ ʜɪs ᴅᴀᴜɢʜᴛᴇʀ, ᴄᴀᴍɪʟᴀ. ʜᴇ ʟᴇᴀᴅs ᴛʜᴇ ᴘᴀᴛᴛᴇʀɴs ᴀɴᴅ ʀᴇᴄᴏɢɴɪᴛɪᴏɴ (ᴘᴀʀ) ᴜɴɪᴛ, ᴀ ᴛᴇᴀᴍ ᴏꜰ ǫᴜɪʀᴋʏ ᴇxᴘᴇʀᴛs sᴏʟᴠɪɴɢ ᴜɴsᴏʟᴠᴀʙʟᴇ ᴄᴀsᴇs.

•ᴡʜᴇɴ ᴅɴᴀ ᴛɪᴇs ᴀ ɴᴇᴡ ᴍᴜʀᴅᴇʀ ᴛᴏ ᴀ ʟᴏɴɢ-ᴅᴇᴀᴅ sᴇʀɪᴀʟ ᴋɪʟʟᴇʀ, ᴛʜᴇ ᴘᴀʀ ᴛᴇᴀᴍ sᴘʀɪɴɢs ɪɴᴛᴏ ᴀᴄᴛɪᴏɴ. ᴀs ᴛʜᴇ ᴋɪʟʟᴇʀ ᴛᴀᴜɴᴛs ɢᴀʀᴅɴᴇʀ ᴡɪᴛʜ ʀɪᴅᴅʟᴇs, ᴛʜᴇ ᴛᴇᴀᴍ—ᴄᴏᴍᴘᴏsᴇᴅ ᴏꜰ ᴀ ᴍᴀᴛʜᴇᴍᴀᴛɪᴄɪᴀɴ, ᴡᴇᴀᴘᴏɴs ᴇxᴘᴇʀᴛ, ᴄᴏᴍᴘᴜᴛᴇʀ ᴀɴᴀʟʏsᴛ, ᴀɴᴅ sᴇᴀsᴏɴᴇᴅ ʟᴇᴀᴅᴇʀ—ᴍᴜsᴛ ᴜsᴇ ᴀʟʟ ᴛʜᴇɪʀ sᴋɪʟʟs ᴛᴏ ᴄᴀᴛᴄʜ ʜɪᴍ. ʙᴜᴛ ᴛʜᴇ ᴄʟᴏsᴇʀ ᴛʜᴇʏ ɢᴇᴛ, ᴛʜᴇ ᴍᴏʀᴇ ᴅᴀɴɢᴇʀ ʟᴏᴏᴍs ᴏᴠᴇʀ ᴛʜᴇɪʀ ʟɪᴠᴇs ᴀɴᴅ ꜰᴀᴍɪʟɪᴇs.

💬 I felt that this was a uniquely written crime novel. It definitely kept me engaged and trying to figure out the case right along these characters. Highly recommend for true crime lovers.

Thank you NetGalley and Minotaur Books for this ARC.

This was so engaging! I didnt know what to expect. I think I expected it to be more scientific and boring but the puzzles in this book really kept me guessing. I am not the best at puzzles so this took a lot of thinking to follow but overall I like it! I would love a follow up to this book!