Apparently, a web of shadows starts to take its course around the Shadowhunters of the London Institute. Meanwhile, Mortmain gears up to utilize his Infernal Devices- a group of the cruel automatons to take down the Shadowhunters. Tessa Gray is the only one weapon that Mortmain requires to complete his plan.

It is not long that Mortmain abducts Tessa and the guys who are head over heels with her, Jem and Will, will stop at nothing to save her. Even though Tessa and Jem are engaged, Will isn’t giving up on her- he is in much love with her like ever.

As those who love Tessa rally to save her from Mortmain, Tessa realizes that the only person to save her is herself. But the only question is, can a single girl take down the entire army of savages?. This installment unveils various episodes of danger, betrayal, secrets, magic, and the remarkable twists of love and loss as the main target remains to be the destruction of the Shadowhunters. A breathtaking fantasy and the final installment in the Infernal Devices trilogy.