August Adams can't escape the mysteries and dangers surrounding rare books. Kill them all. God will recognize his own. These words were spoken at the dawn of the 1209 Cathar Crusade, a war devised to wipe out the most widespread heresy in Europe. But the Cathars held a secret--a mysterious book they kept in hiding. Now it's 2009. August Adams wakes in a pool of blood that isn't his. Without a chance to seek answers, he immediately faces his greatest challenge: a serial killer who seems to select his victims at random. As the clues build, and as August begins to uncover the unbelievable truth, he finds himself neck-deep in a conspiracy that spans centuries. Soon, everything and everyone he loves is in the killer's crosshairs, with no escape in sight. The chase leads from the dark catacombs of a mysterious New York museum to the ancient battleground of a legendary French castle. What August discovers could set history on a bold new course . . . or send it down a path of destruction.