When Harry Witte returns to warn his friends of an ancient threat, Irene Lovell and Cian Shea are skeptical. Harry Witte, after all, has already betrayed them once. But Irene and Cian quickly learn that a new force—a dangerous force—is working in St. Louis. At stake is an ancient artifact known only as the Brittened Crown. Forging an unlikely alliance with Harry, Irene and Cian race to find the pieces of the crown before they fall into the wrong hands. But time is running out, and their enemies have an advantage. And, once again, Cian and Irene must face a traitor in their midst.