The riveting sequel to the #1 New York Times bestselling Clockwork Angel! The situation at the London Institute has never been more precarious. With Mortmain and his clockwork army still threatening, the Council wants to strip Charlotte of her power and hand the running of the Enclave over to the unscrupulous and power-hungry Benedict Lightwood. In the hope of saving Charlotte and the Institute, Will, Jem, and Tessa set out to unravel the secrets of Mortmain's past--and discover unsettling Shadowhunter connections that hold the key to the enemy's motivations and the secret of Tessa's identity.