Tessa finds her heart drawn more and more to Jem, but her longing for Will, despite his dark moods, continues to unsettle her. When they encounter a clockwork demon bearing a warning for Will, they realize that the Magister himself knows their every move-and that one of their own has betrayed them. To unravel the secrets of the past, the trio journeys from mist-shrouded Yorkshire to a manor house that holds untold horrors, from the slums of London to an enchanted ballroom where Tessa discovers that the truth of her parentage is more sinister than she had imagined. He blames them for a long-ago tragedy that shattered his life. With the help of the handsome, self-destructive Will and the fiercely devoted Jem, Tessa discovers that the Magister’s war on the Shadowhunters is deeply personal.

If Charlotte loses her position, Tessa will be out on the street-and easy prey for the mysterious Magister, who wants to use Tessa’s powers for his own dark ends. But that safety proves fleeting when rogue forces in the Clave plot to see her protector, Charlotte, replaced as head of the Institute. In the magical underworld of Victorian London, Tessa Gray has at last found safety with the Shadowhunters. and that love may be the most dangerous magic of all. 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. 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. Friendless and hunted, Tessa takes refuge with the Shadowhunters, warriors dedicated to ridding the world of demons. The Magister, the shadowy figure who runs the Club, will stop at nothing to claim Tessa's power for his own.

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. 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. Magic is dangerous - but love is more dangerous still.

The infernal devices