Clockwork Princess

Tessa Gray should be happy-aren't all brides happy?  Yet as she prepares for her wedding, a net of shadows begins to tighten around the Shadowhunters of the London Institute.  A new demon appears, one linked by blood and secrecy to Mortmain, the man who plans to use his army of pitiless automatons, the Infernal Devices, to destroy the Shadowhunters.  Mortmain needs only one last item to complete his plan. He needs Tessa. Charlotte Branwell, head of the Institute, is desperate to find Mortmain before he strikes.  And Jem and Will, the boys who lay equal claim to Tessa's heart, will do anything to save her.  For though Tessa and Jem are engaged, Will is still in love with her. The last words of a dying Shadowhunter provide the clue that might lead Tessa and her friends to Mortmain.  But their small group cannot stand alone, and the powerful Consul doubts that Mortmain is coming.  Deserted by allies, the Shadowhunters find themselves trapped when Mortmain seizes the medicine that keeps Je