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John McMahon

John McMahon studied Creative Writing at The University of Arizona. In his role as an ad agency creative director, his work has won a Gold Clio for Fiat, and he's written a Superbowl spot for Alfa Romeo. He currently lives in Southern California with his family and two rescue animals. He's hard at work on another P.T. Marsh book and dreams of splitting his time between Cabo San Lucas and Lake Lanier, Georgia.

Genres: Mystery

New and upcoming books

August 2027

The Setup
(PAR Unit, book 3)

Series

Detective P.T. Marsh
   1. The Good Detective (2019)
   2. The Evil Men Do (2020)
   3. A Good Kill (2021)

PAR Unit
   1. Head Cases (2025)
   2. Inside Man (2026)
   3. The Setup (2027)

Award nominations

	2026 ITW Award for Best Series Novel (nominee) : Head Cases
	2026 Barry Award for Best Thriller (nominee) : Head Cases
	2020 ITW Award for Best First Novel (nominee) : The Good Detective
	2020 Edgar Award for Best First Novel (nominee) : The Good Detective

John McMahon recommends

The Woman of the House (2026)
Kate Mooney
"Hauntingly-beautiful prose. Twisty, propulsive, and creepy as hell. Something sinister is alive in this house. I flipped the pages of Kate Mooney's debut quickly and with the dread of knowing that something nightmarish was hiding in the next room over."

When Cicadas Cry (2024)
Caroline Cleveland
"A twisty narrative of secrets and lies, I flew through When Cicadas Cry in a day. A haunting case from the past. A racially tinged murder in the present. And a small South Carolina town about to erupt like a powder keg. Equal parts courtroom thriller and gripping mystery."

Hollywood Hustle (2024)
Jon Lindstrom
"Lindstrom delivers a wild ride in technicolor."

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