London, 1928. Gunshots in Mayfair. A secret society with murderous intent. Archaeological treasures and medieval tombs. A conspiracy that can shake post-war Europe to its very core. A chance encounter and a sudden death. Reverend Christopher Cushing is thrust from his rural backwater into a battle against time, dodging the bullets of hired assassins. He uncovers evidence of a monstrous plot that goes to the heart of the establishment and soon realises that he can trust no one in authority. Cushing and his friends race across Europe, searching for long-lost relics from the time of the Crusades. They have little time to solve the mystery before the conspirators plunge the world into chaos.