1291 AD, Acre. As the city burns under the onslaught of the Sultan's men, the Falcon Temple sets sail, carrying a small band of knights and a mysterious chest entrusted to them by the Order's Grand Master. The ship vanishes without a trace...

Present-day New York. At the Metropolitan Museum, four horsemen dressed as Knights Templar storm the gala opening of an exhibiotion of Vatican tressures and, in a brutal and bloody attack, steal an arcane medieval decoder.

For FBI agent Sean Reilly and archaeologist Tess Chaykin, this is just the start of deadly game of cat and mouse as the race across three continents, trying to stay one step ahead oft ruthless killers while chasing down a centuries-old mystery...