Countdown Zero cover art

Countdown Zero

An Agent Zero Spy Thriller, Book 18

Preview
This Season's Biggest Deal

£0.99/mo for 3 months + £10 Audible bonus

Auto-renews at £5.99/month after 3 months. Cancel monthly.
Get this deal
Offer ends on 28 December, 2026.
More purchase options

Countdown Zero

By: Jack Mars
Narrated by: Brian Callanan
Get this deal

Auto-renews at £5.99/mo. after 3 months. Cancel monthly. Offer ends 28 December, 2026.

Buy Now for £18.29

Buy Now for £18.29

This Season's Biggest Deal | £0.99/mo for 3 months + £10 Audible bonus

£5.99/mo after 3 months - terms apply. Cancel monthly
Summary

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
Espionage Spies & Politics Thriller & Suspense Exciting Submarine
adbl_web_anon_alc_button_suppression_t1
No reviews yet