"Clockwork Angel" is the first book in Cassandra Clare's "The Infernal Devices" trilogy. It's a young adult fantasy novel set in Victorian London and follows the story of Tessa Gray, a young American girl who travels to London to search for her missing brother. However, upon arrival, she is kidnapped by the Dark Sisters and discovers she possesses a unique ability to shape-shift.
Tessa is rescued by a group of Shadowhunters, including Will Herondale and Jem Carstairs, who introduce her to their world of demons, vampires, and other supernatural beings. Together, they unravel a mysterious plot involving a powerful artifact known as the Mortal Cup.
The novel explores themes of friendship, loyalty, and the struggle between good and evil, while also delving into the complexities of love and identity. "Clockwork Angel" blends elements of urban fantasy with historical fiction, offering readers a compelling and action-packed story filled with twists and turns.