From audible.com:

In Brad Thor's highest-voltage thriller to date, Scot Harvath must race to locate an ancient secret that has the power to stop militant Islam dead in its tracks.

June, A.D. 632: Deep within the Uranah Valley of Mount Arafat in Mecca, the Prophet Mohammed shares with his closest companions a final and startling revelation. Within days, he is assassinated.

September 1789: U.S. minister to France Thomas Jefferson, charged with forging a truce with the violent Muslim pirates of the Barbary Coast, makes a shocking discovery - one that could forever impact the world's relationship with Islam.

Present day: When a car bomb explodes outside a Parisian café, Navy Seal turned covert Homeland Security Operative Scot Harvath is thrust back into the life he has tried so desperately to leave behind.

Saving the intended victim of the attack, Harvath becomes party to an amazing and perilous race to uncover a secret so powerful that militant Islam could be defeated once and for all without firing another shot, dropping another bomb, or launching another covert action. But there are powerful men who are determined that Mohammed's mysterious final revelation continue to remain hidden forever.

Hailed by the Chicago Tribune as "quite possibly the next coming of Robert Ludlum", Brad Thor takes listeners across the globe on a heart-pounding chase in which the stakes are higher than they have ever been.