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John McMahon

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John McMahon


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John McMahon is the author of THE GOOD DETECTIVE and THE EVIL MEN DO, both featuring Georgia detective P.T. Marsh.

The New York Times Book Review called McMahon “one of those rare writers who seems to have sprung out of nowhere” and whose debut novel is “pretty much perfect.”

In his role as an ad agency creative director, he has won a Gold Clio for his work on Fiat, and he’s written a Super Bowl spot for Alfa Romeo.

He currently lives in Southern California with his family and two rescue animals.

Combine Editions

Average rating: 3.96 · 20,819 ratings · 3,209 reviews · 5 distinct works • Similar authors
Head Cases (Head Cases, #1)
3.99 avg rating — 12,018 ratings — published 2025 — 8 editions
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The Good Detective (Detecti...
3.81 avg rating — 5,314 ratings — published 2019 — 16 editions
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The Evil Men Do (Detective ...
3.99 avg rating — 1,789 ratings — published 2020 — 11 editions
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A Good Kill (Detective P.T....
4.20 avg rating — 1,316 ratings — published 2021 — 5 editions
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Inside Man (Head Cases, #2)
4.15 avg rating — 382 ratings — expected publication 2026 — 5 editions
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More books by John McMahon…

Series by John McMahon

Head Cases Inside Man
(2 books)
by
4.00 avg rating — 12,396 ratings

The Good Detective The Evil Men Do A Good Kill
(3 books)
by
3.91 avg rating — 8,419 ratings

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Quotes by John McMahon  (?)
Quotes are added by the Goodreads community and are not verified by Goodreads. (Learn more)

“Over two hundred bacteria thrive on each square inch of our palms. “Gardner Camden,” I said, shaking. I’m not OCD. I just know things like this.”
― John McMahon, Head Cases
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