Danger, betrayal, and enchantment abound in the exhilarating Booklist conclusion to the 1 New York Times bestselling Infernal Devices trilogy—now with a gorgeous new cover, a new foreword, and exclusive bonus content! Clockwork Princess is a Shadowhunters novel. THE INFERNAL DEVICES WILL NEVER STOP COMING A net of shadows begins to tighten around the Shadowhunters of the London Institute. Mortmain plans to use his Infernal Devices, an army of pitiless automatons, to destroy the Shadowhunters. He needs only one last item to complete his plan he needs Tessa Gray. Charlotte Branwell, head of the London Institute, is desperate to find Mortmain before he strikes. But when Mortmain abducts Tessa, the boys who lay equal claim to her heart, Will and Jem, will do anything to save her.