Countdown Zero

An Agent Zero Spy Thriller, Book 18

By: Jack Mars

Narrated by: Brian Callanan

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 listening voraciously until the early hours.

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

©2026 Jack Mars (P)2026 Jack Mars

Another action packed Agent Zero story line!

The Lawson family is evolving & still fighting crime. I’m hooked on the Agent Zero series!

disappointed

reading and writing lack luster.. Had expected more out of jack mar's books, won't do any more in this series

This series lost the plot a long time ago

Every book in this series is a significant step down since about the fifth one. It’s gone enough off the rails to warrant a bad review. The inner dialogue of the characters is probably the most glaring stupidity, but it’s a representation of how bad the story around it is.