Dead of night. Salonika, Greece, December 1939. A clandestine order of monks embarks on a desperate mission: to transport a mysterious vault to a hiding place high in the Italian Alps. Its sinister contents, concealed for centuries, could rip apart the Christian world. Now, as the Nazi threat marches inexorably closer, good men and evil will be drawn into a violent and deadly hunt, sparking a relentless struggle that could forever change the world as we know it.