Wednesday, February 25, 2026

Review of "Inside Man: A Head Cases Thriller" by John McMahon

 

 

In this second book in the 'Head Cases' series, a special unit of the FBI investigates a domestic militia and searches for a serial killer. The book can be read as a standalone but I'd advise readers to begin with Head Cases.

*****

The Pattern and Recognitions (PAR) unit of the FBI, based in Miami, Florida, is called in for difficult and abstruse cases. PAR agents are brainiacs with unique abilities, like eidetic memory, math expertise, etc. The leader of the PAR, who narrates the story, is Agent Gardner Camden.



Initially, the PAR agents were confined to office work, studying the evidence and files from unsolved cases, to look for new clues. Now, PAR personnel go into the field, where they encounter trouble and life-threatening danger.

The current members of the PAR are:

✦✦ Gardner Camden - lead agent of the PAR and the book's main protagonist.

Gardner is a socially awkward 'by the book' agent with an eidetic memory. Gardner observes about himself: "Riddles. Those are my specialty. That is, when I am not studying patterns. Or decoding enigmas. Some might say that solving puzzles is all I'm good for. That leaving my desk in the FBI to interact with real people is not the best use of my time or talent. And I would agree with them."



When Gardner's daughter Camila was a baby, Gardner had his wife Anna sent to prison for RICO violations. Now Gardner is raising 8-year-old Camila with the help of his mother-in-law Rosa, who's very angry about Anna.



Gardner's own mother, a psychiatrist who knew Gardner's mind was different from other people, brought Gardner up with helpful advice. She would say: 'It's beautiful to be unlike other people; A full life is full of people, not facts; Never use your intellect as a weapon'; and more.



Now, Gardner's mother, who has dementia, is in a coma due to an incident in 'Head Cases'.

✦✦ Cassie Pardo - a mathematician.

Cassie is an expert at what are called imaginary and unknown numbers. Cassie is often tasked with analyzing crime scenes and finding creative solutions to difficult problems. Cassie is a dynamo of energy and frequently uses youthful slang, such as 'dayger' (daytime rager) and 'it slays'.



Cassie and Gardner have romantic sparks, but their jobs make it difficult to move ahead with a personal relationship.

✦✦ Joanne (Shooter) Harris - a sharpshooter.

Joanne learned to track from the age of six and to shoot from the age of eight. Joanne was on the Olympic shooting team before joining the FBI, and she's a markswoman and ballistics expert who can instinctively trace the trajectory of a bullet.



Joanne is the jokester of the PAR team, and can't resist wisecracks and witty remarks. To demonstrate, Joanne tells Gardner, "I used to date a guy who worked at the morgue. Eventually he decided it was a dead end job."

✦✦ Richie Brancato - the rookie agent.

Richie joined the PAR right out of Quantico, partly because his grandfather used to be the FBI director. Richie has been called a 'nepo agent', but he's shown he belongs in the PAR because he's brave, confident, and can pick out important clues from reams of research and data.



Richie considers himself "a foodie through and through", and for lunch one day, Richie buys Minorcan clam chowder for the PAR team.



*****

As the story opens, Freddie Pecos - a confidential informant (CI) for the PAR - has been shot dead. Gardner and Shooter find Freddie's body in his trailer and search the premises, where they find boxes of bogus debit cards and cash.
.


Freddie was giving the PAR information about an unemployment scam netting millions of dollars for a domestic right wing militia run by arms dealer J.P. Sandoval.



Pecos revealed that Sandoval was amassing a supply of unmarked weapons with no serial numbers (ghost guns). These were meant to be used against law enforcement personnel, the motto being "Kill a cop. Drop the gun. And walk away."



On top of that, the PAR lost track of a quarter-million-dollar gun shipment sent to the militia. It would appear Sandoval is planning a MAJOR domestic terror attack in the near future.



FBI director Craig Poulton tells PAR leader Gardner Camden, 'Get a new CI, find the shipment of guns, and figure out what's going on with the ghost guns, and do it NOW.'



PAR's first order of business is to investigate the murder of Freddie Pecos, and a blurry photo from a Miami ATM machine - showing an unidentified man speaking to Freddie - is an important clue. In a eureka development, it turns out the unidentified man is also a serial killer who's been murdering women in North Florida.



After this discovery, the PAR has two missions: find the illegal weapons purchased by the militia, and catch the serial killer. The dual investigations require PAR agents to fly back and forth between North Florida and South Florida, drive to towns and cities all over the state, liaise with a number of sheriffs and police departments, go to Washington, DC, and more. Along the way there's adventure, danger, and life-threatening situations.



In the midst of all this, Gardner also goes home when he can, to be with his daughter Camila. Gardner plays riddle and puzzle games with Camila, takes her out for ice cream, goes to her science fair, and so on.

The PAR manages to resolve both cases, but there's big trouble along the way.



Author John McMahon provides picturesque descriptions of Florida, which gives the book an authentic atmosphere. To illustrate, while Gardner is driving, he observes, "On my left, was the wide expanse of Florida, home to endless farms, as well as hundreds of miles of wetlands. The agriculture included tree nuts and berries, melons, sweet potatoes, and tobacco. Livestock ranches sold sheep, donkeys, and cattle. Some even cultivated Christmas trees."



I enjoyed the book, which is a police procedural and thriller. My major criticism is that the resolution of the serial killer case seems abrupt and unlikely. Still, I'd recommend the book to mystery fans, especially readers who liked 'Head Cases.'

Thanks to Netgalley, John McMahon, and Minotaur Books for an ARC of the novel.

Rating: 3.5 stars 

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