Clockwork Angel; Clockwork Prince; Clockwork Princess by Cassandra Clare

Set in Victorian London, a young woman with a mysterious, shape‑changing power is drawn into a secret society of demon‑hunters and becomes entangled with two very different young men—one brooding and impulsive, the other gentle and ill—forming deep bonds of love and friendship. As a sinister inventor unleashes clockwork automatons and plots to destroy their world, loyalties are tested, hidden pasts are revealed, and the characters face wrenching choices and sacrifices that will reshape their lives and their understanding of identity and duty.

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