Cross Protocol (Connor Cross #4)

Cross Protocol (Connor Cross #4) by Jack Mars is out now (published November 1, 2026).

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Cross Protocol (Connor Cross #4)

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Cross Protocol (Connor Cross #4) Release Date: November 1, 2026

Published

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

CROSS PROTOCOL (Book #4) is the fourth book in an electrifying new action thriller series from the #1 bestselling and USA Today bestselling author Jack Mars (with over 10,000 five-star reviews). The series begins with CROSS TARGET (Book #1).

Former Special Forces soldier Connor Cross rescues key individuals from the most dangerous places in the world, when the U.S. government needs it handled discreetly and unofficially. But when the missions become something much bigger, affecting the very world’s stability, Connor must wonder: is he a pawn in a much bigger game of chess?

In CROSS PROTOCOL (Book #4), when Connor slips into Moscow to extract a Russian aerospace engineer willing to risk everything to defect, an intercept team turns a clean operation into a desperate running fight. As the mission unravels and the truth behind the defection emerges, Connor realizes the man he came to save was never the real prize.

Connor Cross doesn’t do simple missions — and neither does this series, where every operation unravels into something bigger, deadlier, and harder to walk away from. Explosive action, relentless pacing, and twists you won’t see coming make this a series that demands to be read in one sitting. Perfect for fans of Vince Flynn, David Baldacci, and Michael Connelly.

Future books in the series are also available!

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Genre: Thriller

Jack Mars

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