Maximum Peril (Grant Valor #5)

Maximum Peril (Grant Valor #5) by Jack Mars is out now (published December 2, 2025).

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Maximum Peril (Grant Valor #5) Release Date: December 2, 2025

Published

‘Thriller writing at its best.’
–Midwest Book Review (Any Means Necessary)
⭐⭐⭐⭐⭐

From the #1 bestselling and USA Today bestselling author Jack Mars (with over 10,000 five-star reviews) comes a riveting new action thriller series. When the world comes under threat, an elite international team is called in, designed to handle the highest of stakes and led by former Army Ranger Grant Valor.

In MAXIMUM PERIL (Book #5), when major dams fall under terrorist control, it’s up to Grant Valor and his team to dive deep into hostile waters and dark tunnels to avert global catastrophe. But Grant’s battle isn’t just against the merciless current—he’s fighting a ruthless adversary hell-bent on turning natural wonders into weapons of mass obliteration.

The Grant Valor series delivers an explosive and monumental thrill-ride, brimming with twists that will shock and awe you at every turn. With a band of unforgettable characters whose gripping saga will compel you to devour pages deep into the twilight hours, fans of Brad Thor, Tom Clancy, and Vince Flynn are sure to fall in love.

Future books in the series are also available!

‘Thriller enthusiasts who relish the precise execution of an international thriller, but who seek the psychological depth and believability of a protagonist who simultaneously fields professional and personal life challenges, will find this a gripping story that’s hard to put down.’
–Midwest Book Review, Diane Donovan (regarding Any Means Necessary)
⭐⭐⭐⭐⭐

‘One of the best thrillers I have read this year. The plot is intelligent and will keep you hooked from the beginning. The author did a superb job creating a set of characters who are fully developed and very much enjoyable. I can hardly wait for the sequel.’
–Books and Movie Reviews, Roberto Mattos (re Any Means Necessary)
⭐⭐⭐⭐⭐

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Genre: Thriller

Jack Mars

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