In 1291, a young Templar knight flees the fallen holy land in a hail of fire and flashing sword, setting out to sea with a mysterious chest entrusted to him by the Order's dying grand master. The ship vanishes without a trace. In present day Manhattan, four masked horsemen dressed as Templar Knights stage a bloody raid on the Metropolitan Museum of Art during an exhibit of Vatican treasures. Emerging with a strange geared device, they disappear into the night. The investigation that follows draws archaeologist Tess Chaykin and FBI agent Sean Reilly into the dark, hidden history of the crusading knights?and into a deadly game of cat and mouse with ruthless killers?as they race across three continents to recover the lost secret of the Templars.