To conquer the demons without, one must first recognize those within." Tertullian - 148 A.D. It is Christmas Eve in Rome, and the Pope is dying. Among millions of faithful who have come to share in his final Mass, is an American doctor on a mission; to bring the world to an end. A mismatched quartet of ordinary people are unwillingly stitched together by events over which they have no control, and propelled toward battle with an unseen horror that...