Thousands of years ago, King Solomon used a powerful ring, known as the Great Seal, to imprison the fallen angels of heaven in a sacred vessel. Now both the ring and the vessel have been stolen from OIPEP by a double-crossing Mike Arnold. Should Mike choose to wield the demons' power, all hell could break lose . . . literally. Led by the mysterious Op-Nine, OIPEP has a plan to retrieve the artifacts, and their success depends on the least likely candidate, none other than the last descendent of Lancelot, Alfred Kropp. In this thrilling new adventure, author Rick Yancey proves once again that Alfred Kropp's unlikely role as a world-saving hero is definitely no accident.