Clockwork Angel: When sixteen-year-old Tessa Gray crosses the ocean to find her brother, her destination is Victorian London, but something terrifying is waiting for her in London's Downworld, where vampires, warlocks and other supernatural folk stalk the gaslit streets. Only the Shadowhunters, warriors dedicated to ridding the world of demons, keep order amidst the chaos. Kidnapped by the mysterious Dark Sisters, members of a secret organization called the Pandemonium Club, Tessa soon learns that she herself is a Downworlder with a rare ability: the power to transform, at will, into another person. What's more, the Magister, the shadowy figure who runs the Club, will stop at nothing to claim Tessa's power for his own.

Clockwork Prince: In the magical underworld of Victorian London, Tessa Gray has at last found safety with the Shadowhunters. But fortune proves fleeting when counselor Mortmain and his clockwork army arrive to destroy them. Mortmain needs Tessa to fulfill his plan, and he will stop at nothing to get her. Tessa, caught between her feelings for the beautiful, tortured Will and the devoted Jem, must find the strength to save herself and her friends.

Clockwork Princess: If the only way to save the world was to lose what you loved most, would you do it? The clock is ticking. Everyone must choose.