Magic is dangerous — but love is more dangerous still. WHEN SIXTEEN-YEAR-OLD TESSA GRAY crosses the ocean to find her brother in Victorian England, something terrifying is waiting for her in London's Downworld. Kidnapped by the mysterious Dark Sisters, who are members of a secret organization called the Pandemonium Club, Tessa soon learns that she has the power to transform at will into another person. The Magister, the shadowy figure who runs the Club, will stop at nothing to claim Tessa's power for his own. Friendless and hunted, Tessa takes refuge with the Shadowhunters, warriors dedicated to ridding the world of demons. She soon finds herself fascinated by — arid torn between — two best friends: James, whose fragile beauty hides a deadly secret, and Will, whose volatile moods keep everyone at arm's length. As their search draws them deep into a plot that threatens to destroy the Shadowhunters, Tessa realizes that she may need to choose between saving her brother and helping her new friends save the world ... and that love may be the most dangerous magic of all

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 not only to the enemy's motivations, but also to the secret of Tessa's identity. Tessa, already caught between the affections of Will and Jem, finds herself with another choice to make when she learns how the Shadowhunters helped make her a 'monster.' Will she turn from them to her brother, Nate, who has been begging her to join him at Mortmain's side? Where will her loyalties — and love — lie? Tessa alone can choose to save the Shadowhunters of London.or end them forever

Danger intensifies for the Shadowhunters as the New York Times bestselling Infernal Devices trilogy comes to a close. If the only way to save the world was to destroy what you loved most, would you do it? The clock is ticking. Everyone must choose. Passion. Power. Secrets. Enchantment. Danger closes in around the Shadowhunters in the final installment of the bestselling Infernal Devices trilogy