When ex-army officer and UNESCO archaeologist Max Hunter is sent to Normandy on the trail of England’s missing crown jewels, he thinks he’s in for a few easy weeks.
But when the ancient Mont Saint-Michel abbey is attacked by gunmen, Hunter and his research assistant Lauren Lane are forced to flee for their lives with a mysterious treasure chest hidden for centuries inside the abbey. After evading the assassins, Hunter and Lauren find something inside the chest with world-changing consequences.
The search for the truth joins Hunter back up with Amy Fox and the rest of HARPA, but even faced with devastating news about the team, they must race across Europe in the footsteps of an enigmatic warrior monk, trying to decipher his ancient code and beat the armed assassins to the greatest treasure of all-time.