A prequel to Cassandra Clare's Mortal Instruments series, The Infernal Devices is the story of Tessa Gray, a sixteen-year-old American girl traveling alone to Victorian London who runs afoul of the city's sordid supernatural underworld. Rescued by the Shadowhunters of the London Institute, Tessa quickly finds herself caught up in an intrigue that may very well destroy her new friends - including the two enigmatic young men, Jem and Will, who have taken her under their wing...

The threat of Mortmain's Infernal Devices looms as the Shadowhunters race to work out a way to counteract the mechanical monsters. Meanwhile, plans for Tessa's marriage to Jem are underway, despite her fiancé's failing health and the unresolved feelings between her and Will. When Tessa is captured, Will must leave his comrade behind to save the woman they both love... But with the final missing piece--Tessa herself--in Mortmain's possession, can anything stop his plot for revenge?

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 tangled threads of love and loss intertwine as the Shadowhunters are pushed to the very brink of destruction in this breathtaking conclusion to the Infernal Devices trilogy.

A prequel to Cassandra Clare's Mortal Instruments series, The Infernal Devices is the story of Tessa Gray, a sixteen-year-old American girl traveling alone to Victorian London who runs afoul of the city's sordid supernatural underworld. Rescued by the Shadowhunters of the London Institute, Tessa quickly finds herself caught up in an intrigue that may very well destroy her new friends - including the two enigmatic young men, Jem and Will, who have taken her under their wing...

A prequel to Cassandra Clare's Mortal Instruments series, The Infernal Devices is the story of Tessa Gray, a sixteen-year-old American girl traveling alone to Victorian London who runs afoul of the city's sordid supernatural underworld. Rescued by the Shadowhunters of the London Institute, Tessa quickly finds herself caught up in an intrigue that may very well destroy her new friends - including the two enigmatic young men, Jem and Will, who have taken her under their wing...

A prequel to Cassandra Clare's Mortal Instruments series, The Infernal Devices is the story of Tessa Gray, a sixteen-year-old American girl traveling alone to Victorian London who runs afoul of the city's sordid supernatural underworld. Rescued by the Shadowhunters of the London Institute, Tessa quickly finds herself caught up in an intrigue that may very well destroy her new friends - including the two enigmatic young men, Jem and Will, who have taken her under their wing...

A prequel to Cassandra Clare's Mortal Instruments series, The Infernal Devices is the story of Tessa Gray, a sixteen-year-old American girl traveling alone to Victorian London who runs afoul of the city's sordid supernatural underworld. Rescued by the Shadowhunters of the London Institute, Tessa quickly finds herself caught up in an intrigue that may very well destroy her new friends - including the two enigmatic young men, Jem and Will, who have taken her under their wing...