Inside Man (Head Cases, #2) by John McMahon Narrator: Will Damron
Format: audiobook, eARC
Formats available: hardcover, ebook, audiobook
Genres: mystery, suspense, thriller
Series: PAR Unit #2
Pages: 390
Published by Macmillan Audio, Minotaur Books on January 13, 2026
Purchasing Info: Author's Website, Publisher's Website, Amazon, Barnes & Noble, Kobo, Bookshop.org, Better World Books
Goodreads
In this sequel to McMahon's electrifying series debut, Head Cases, Gardner Camden and the PAR team return to investigate potentially connected cases.
FBI Agent Gardner Camden is an analytical genius with an affinity for puzzles. He and his squad of brilliant yet quirky agents make up the Patterns and Recognition (PAR) unit, the FBI’s hidden edge, brought in for cases that no one else can solve.
PAR’s latest case involves a militia group stockpiling weapons. When their confidential informant in the case is killed, it quickly becomes clear that the militia did not kill him.
As the squad looks into the evidence surrounding his murder, an unidentified man is caught on camera with their informant. This mystery man’s picture is connected to another case at the FBI, an unsolved series of murdered women, buried in the ground in north Florida. Could they have uncovered a serial killer? And if so, what is his connection to their C.I.?
As PAR juggles an investigation into both the dead women and the militia, they enroll a new informant, only to find the case escalating in dangerous ways. How will PAR handle a case that increasingly looks like a terrorist plot? And in the serial case, with no puzzles or witnesses, and few leads, how will a group set up to decode riddles be successful?
My Review:
The first book in this series, Head Cases, set up the characters and the structure of the FBI unit they work in, the Patterns and Recognition Unit, or PAR. They’re the ‘head cases’, the freaks, the ones who solve cold cases that defy ordinary investigative methods because something about the case isn’t ordinary – and neither are they.
PAR is also a collection of agents who have pissed off the brass in ways that are not firing offenses. Like shooting into a pattern that read F-U-C-K C-O-N-G-R-E-S-S on the wall of targets at a federal gun range, while a senator was visiting said gun range. That sort of thing isn’t a crime, it isn’t illegal, but it is guaranteed to get someone sent to the equivalent of career Siberia. Or, in the case of this series, PAR.
In Head Cases, the unit was led by a senior FBI agent named Frank Roberts. But Frank kept too many secrets from his own team in the hopes of getting a supervisory assignment back out in the wider – and more respected – parts of the FBI before the PAR Unit got closed down. He made his own escape path and kind of left the rest of ‘his’ team hung out to dry.
Except the rest of that team, spearheaded by Agent Gardner Camden, solved the serial killings, saved the day, the PAR Unit and literally saved Frank’s ass. Frank got his reward back home in Texas, and Gardner got the supervisory position, always aware that the unit was one step away from being disbanded if they didn’t deliver.
Camden, often referred to by his fellow FBI agents as THE head case among the head cases, knows that his strengths lie in figuring out the pattern and not in supervision. Or management, or office politics. He’s doing his best, working with the skills he does have, to make it work. And it mostly does.
At least until their current case threatens to blow itself sky high. They’ve spent three months following a fraud, guns and racketeering case. A big one involving fraudulent unemployment accounts – and the money paid into those accounts, illegal arms sales, and domestic terrorism – facilitated by those illegal arms sales bought with those illegally gotten funds. It’s a criminal enterprise that crosses at least one state line (Florida to Georgia and back) and has left behind a trail of bodies – and will leave more if their leader’s plans and ambitions continue on the track he’s already laid out.
The FBI’s confidential information or CI (read that as either ‘inside man’ or snitch) has heard rumors about this domestic terrorism militia purchasing several thousand kits to make ‘ghost guns’ that would have no true manufacturer or serial number. (It’s a loophole in the law and it’s being exploited, potentially to devastating effect.) It’s the FBI’s mission to find those kits and stop them from being turned into guns before they start firing.
Which is when the case goes pear-shaped. (I can’t say it goes south as they are already nearly as far south in Florida as they can get.) They find their snitch shot dead in his trailer, along with plenty of evidence, including CASH, related to the financial parts of the case.
He wasn’t shot by the people he’s snitching on, or they’d have removed the evidence. They also wouldn’t be on the way to check in with the guy and figure out why HE hasn’t been checking in. So who killed the snitch? And how can they keep the case from blowing up and taking their careers and who knows how many innocent lives, along with them?
Camden and the PAR Unit know there must be a pattern, They just have to find it. Whether or not anyone in the FBI thinks it has anything at all to do with the case they started with. Because it must.
Escape Rating A+: This is a story that I began in audio, and was certainly enjoying in audio. The narration by Will Damron was very well done and he did an excellent job of sounding like I expected Camden to sound while still giving the rest of the characters their own distinct voices. But I got caught between the dilemma that the audio was good but my reading is considerably faster, and I couldn’t stand the idea of waiting over a weekend to continue the story. So I switched to text and couldn’t put the thing down.
That being said, I picked this up in the first place because I fell headlong into the first book in this series, Head Cases, late last summer. I was absolutely riveted AND it was also a case of the ‘right book at the right time’ to the nth degree. So I grabbed the eARC of the second book up before I was even finished with the first one. I knew it was going to be THAT good. And it was.
Very much like the first book, what makes this case interesting is the way that it spirals outward in directions that no one, including the team doing the investigating, expects AT ALL. They think they’ve got one thing, and they do have to deal with that thing because the idea of a gang of domestic terrorists with ghost guns shooting up Washington DC should give anyone pause. That it particularly gives ALL the federal agencies that would either be caught in the crossfire or whose lives and careers will be toast if they fail to stop it from happening an absolute mania to catch the would-be terrorists before they strike another round of terror is exactly what one would expect. And should.
However, as big as that crime is/would be/could be, it’s not what’s driving the PAR Unit. Their search for their CI’s killer has uncovered a serial killer. Their skills at pattern recognition have unearthed several body dumping sites. They’re off on an entirely different – and not completely sanctioned – race than the one the rest of the FBI is on, yet they’re involved in both up to their necks.
It’s fascinating – and not done all that often in fiction – to see this small unit try to work two high priorities at the same time. They can’t – and in real life probably wouldn’t be – focused entirely on a single case no matter how important. Also the way that resources are allocated at the level above them shines a spotlight on how upper level priorities affect funding which affects focus on what the political powers-that-be believe is most important.
So there was a lot going on throughout this whole story, and it kept me reading long after I should have quit for the night. I had to see what happened next – and what ultimately did or did not tie the two cases together. Because they shouldn’t have been but they absolutely were.
Part of what makes the series compelling to follow are the personalities of the members of the PAR Unit itself. They each bring a whole lot of quirks, a fair bit of irreverence regarding authority, and a lot of widely different experience to the table. They do an excellent job of filling the roles of a classic “five-man band”, especially when they get their fifth member back as this story progresses.
But speaking of the characters, it’s impossible for me to read Gardner Camden’s series without thinking of George Cross’ series that begins with The Dentist. I held off on reading my next book in THAT series until I finished this book because they are a bit too similar – even though they’re not actually as much alike as one might think.
Both Camden and Cross are on the autism spectrum, and both seem to be in the same part of that spectrum. Highly intelligent, often hyper focused, with low emotional affect and engagement. In other words, what was referred to as Asperger’s syndrome not that long ago and both would have been labelled so as children as they are both in their mid-to-late 30s. Both went into police work, but Camden with the FBI in the US and Cross on a local level in Britain. It would seem like their stories should be similar, and there are similarities, but not as many as the reader might think going in as their approaches to both themselves and the world they live in are different.
Cross is aware that he is different, but he expects the world and everyone around him to bend in order to work with those differences. His world revolves around himself and he believes that everyone else should make the adjustments. Camden, very much on the other hand, while he is just as certain of who he is and how he works best, also recognizes that the world is not made for him anymore than he is made for it. He adapts as much as he can to the way things work, and is very aware of when his hyperfocus gets in the way of getting the human-facing parts of the job done. In this book he is the supervisor of the PAR Unit, and is all too cognizant of that fact that he is no good at playing politics, and that he has to find a way to be a leader for the team and a mentor for their rookie whether those things are natural for him or not, if he wants to keep the job.
So this book managed to both give me a lot to think about, as I couldn’t stop comparing Camden to Cross, at least inside the confines of my own head, and I couldn’t stop reading late into the night/morning because I had to find out not just ‘whodunnit’ but who done each of the parts of the ‘it’ the PAR Unit was following.
I had a grand reading time, so I was just a bit sorry to read at the end that the author has a lot of writing irons in the fire and while he intends to come back to PAR, he isn’t exactly sure about when. While I’ll need to look up his other series, AND look for whatever direction his work takes him, in the meantime if I want to scratch at least around this particular itch I’m glad that I have more of the Cross series to read – and most likely soon because I’ve got a book hangover that needs to be assuaged somehow.
The Midnight Taxi by 
Trailbreaker (Prairie Nightingale) by 
BUT, then I saw this tour, and did look more closely at the authors’ names and remembered that I loved both their books (
Only the people who know about Prairie’s involvement well, know. Along with some people who made it their business to know. And that’s where Bernie Dubicki comes in.
Escape Rating A: Trailbreaker was even better than 
Which, by a circuitous route, leads back to the mouse poop on the conference room table and the team’s varying, but typical for each individual, reactions to it.
Second, I do enjoy the understated, hesitant, step forward and back romance between Prairie and Foster Rosemare. I’m not saying they should pick up the pace because it feels right this way under their circumstances. But there’s starting to be a feeling that what’s keeping the pace so slow is at least partly the long arm of coincidence inserting interruptions and taking him out of town at critical moments. That long arm can get brittle if it gets too long and starts seeming too coincidental. It’s not there yet but it is getting there. (My two cents and your reading mileage may vary.)
Stolen in Death (In Death, #62) by 
This 62nd entry in the 
So off she goes to the home of Nathan Barrister, dead on the scene, while she’s still dressed to hobnob with the rich and famous. Which is exactly what she’s doing at Barrister’s residence. It’s just that the man himself is dead, in the midst of what looks like an interrupted burglary, with a floor-to-ceiling safe full of priceless stolen treasures gaping open and sparkling behind his body.
But Senior has been dead for months by the time his son gets murdered over the Royal Suite, which has been stolen (again) straight out of a vault that not even the family knew existed until after the old man was gone. Whatever he was responsible for then – he can’t be responsible for the theft and murder now.
The other villain was all wrapped up in the reasons why Dallas wasn’t quite as confident that Roarke’s past wasn’t about to come back and bite them as he was, because it already was. Just as the Royal Suite was from one of his jobs back in the day, so was the second villain. Magdelana Percell has tried to get Roarke back before, particularly in 
This series is always a comfort read for me, and this entry was no exception. I loved catching up with the progress on Peabody’s and McNab’s (and Mavis’, Leonardo’s and Bella’s) new house, Detective Sergeant Jenkinson’s latest eye-watering ties and especially Galahad’s ongoing campaign to steal breakfast from his humans. The case wasn’t the biggest or most complicated one that Dallas has ever solved, but watching her team’s process of pulling together the complex web of threads was as fun as ever. That this particular investigation held a dark thread of angst on Dallas’ part regarding Roarke getting caught over his ‘former’ career added a layer of tension even as his smugness over his previous accomplishments lightened the mood while they each worried about the consequences to the other.
Make It Out Alive (Quinn & Costa, #7) by 
I’ve read the 
So instead of a slam-dunk arrest AFTER the killer had them trussed up and on the way to his vehicle they caught him after the pair had been drugged but before they’d been restrained. The perp’s explanation of oh-so-many coincidences is tissue-paper thin – but there’s really nothing that can’t be explained – however badly – and no physical evidence to tie him to anything at all.
Escape Rating B+: This is a hugely mixed feelings kind of review, and I’m a bit bummed because I was expecting my second “Allison” of the week to be every bit as good as the 
Their absence leads to the second thread, which is, of course, the mobilization of their team AND seemingly most of the resources of the entire FBI in finding them.
Thrillers like this one where we see inside the killer’s head either creep me right the fuck out or trip my willing suspension of disbelief. This one did the second even though it was trying to do the first. She was just over the top and cartoonish even though she wasn’t a cartoon supervillain – no matter how much she wanted to be.
While on my third hand, I’d have liked this one a hell of a lot better if we didn’t have a peek into the villain’s head – even if, thank goodness, it’s not a direct first-person perspective. It was kind of expected that she was a self-centered narcissistic psychopath, but the one-note whininess was just over the top – and not in a good way.
Homemaker (Prairie Nightingale, #1) by 
Escape Rating A-: Anyone who knows me at all would laugh at the idea of me reading a book titled Homemaker because of all the things I NEVER wanted to be, a homemaker is at the top of the list. I never had any ambitions whatsoever to be a domestic goddess, a domestic engineer, or a homemaker. Paraphrasing several Dr. Who incarnations, I mostly just don’t do domestic.
Edge (Detective Harriet Foster, # 4) by 
This doesn’t start out as a homicide case at all. Harriet was taking a walk early in the morning on what should have been her day off. She never expected to find two bodies on the grass behind the closed gates of a park. From a distance, it looks like two dead teenagers. Close up, it looks like a couple of kids dead of either an overdose.
Escape Rating A+: I held off on putting together my Best Books list for this year because I expected Edge to be a contender for that list. I was NOT disappointed. This whole series, beginning with 
But still and all, what makes this book and this series work for this reader is the character of Harriet Foster herself, not just as a cop but as a woman trying to put herself back together after more tragedy than any one person should have to live with. But she does and its utterly absorbing to watch her work.
The Witch's Orchard by 
I couldn’t put this one down, I couldn’t turn my eyes away, and I can’t stop thinking about it. My reading group said this one was good – but I wasn’t expecting it to be THIS good.
A part of this one that was kind of icing on the cake was the way that folklore and storytelling influenced the case, the original investigation, the intervening decade, AND Annie’s path to the truth. There’s an old story about “The Witch of Quartz Creek” that Annie hears over and over. But each telling is just a bit different, depending on the perspectives and situation of the person telling it. Inside each version is a kernel of the truth, so it’s in the repeated similar but not the same variations that finally leads Annie to the long-hidden truth. (That part reminded me a bit of 
The Black Wolf (Chief Inspector Armand Gamache, #20) by 
This book begins in the exact same place where the previous book, 
Escape Rating A++: Like last year’s 
And he’s not the only one being misled, which is where this story gets into the real and the scary and the all-too-frighteningly possible. Even probable over the long term. And where those fears directly intersect with the power of social media, the willingness of humans to give up a little privacy for a little security, and the ability of demagogues, particularly when amplified by an internet megaphone that allows the truth to be manipulated right before their very eyes, to manipulate the very same “Ministry of Truth” that George Orwell portrayed in 1984.
Framed in Death (In Death, #61) by 
Escape Rating B: Some entries in the marvelous and marvelously long-running 
Not that I didn’t love the righteous takedown at the end.