Countdown Zero (An Agent Zero Spy Thriller—Book #18)

“You will not sleep until you are finished with AGENT ZERO. A superb job creating a set of characters who are fully developed and very much enjoyable. The description of the action scenes transport us into a reality that is almost like sitting in a movie theater with surround sound and 3D (it would make an incredible Hollywood movie). I can hardly wait for the sequel.” --Roberto Mattos, Books and Movie Reviews

COUNTDOWN ZERO is book #18 in the #1 bestselling AGENT ZERO series, from #1 bestselling and USA Today bestselling author Jack Mars (with over 10,000 five-star reviews). The series begins with AGENT ZERO (Book #1), a free download.

Beneath the ocean's surface lurks a submarine gone rogue, threatening coastal chaos with hypersonic missiles unless their ransom demands are met.

With only 24 hours to halt the countdown to devastation, Agent Zero must navigate a deadly game of cat and mouse beneath the waves—a game where one wrong move could lead to catastrophic consequences.

The AGENT ZERO saga offers a gripping journey packed with unexpected turns and dynamic action, keeping you enthralled from start to finish. At the core of this thrilling series is an engrossing relationship between a father and his daughter, which is sure to keep you reading voraciously until the early hours.

Books #19--#24 in the series are also available!

“Thriller writing at its best.” --Midwest Book Review (Any Means Necessary) ⭐⭐⭐⭐⭐

“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) ⭐⭐⭐⭐⭐

© 2026 Jack Mars (Libro electrónico): 9798894820439

Fecha de lanzamiento

Libro electrónico: 24 de enero de 2026