Book 3

Cover of Clockwork Princess: The Mortal Instruments Prequel

A net of shadows tightens around the Shadowhunters of the London Institute. Mortmain plans to use his Infernal Devices, an army of pitiless automatons, to destroy them. He needs only one last item to complete his plan: he needs Tessa Gray. When Mortmain abducts Tessa, the boys who lay equal claim to her heart, Jem and Will, will do anything to save her. For though Tessa and Jem are now engaged, Will is as much in love with her as ever. Danger and betrayal, secrets and enchantment, and the tang...