1291 AD Acre. As the city burns under the onslaught of the Sultans men the Falcon Temple sets sail carrying a small band of knights and a mysterious chest entrusted to them by the Orders Grand Master. But 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 exhibition of Vatican treasures 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 a deadly game of cat and mouse as they race across three continents in search of the ruthless killers - and a centuries-old mystery...