Clockwork Angel (Book 1): Tessa, an orphan, seeks her missing brother Nathaniel, and is drawn into the world of Shadowhunters after being kidnapped by the Dark Sisters, members of a secret organization called the Pandemonium Club. She learns she is a Downworlder with the ability to transform and finds herself torn between two Shadowhunters, Jem and Will, while facing the Magister's plot to claim her power.