When seventeen-year-old orphaned shapechanger Tessa Gray is kidnapped by the villainous Mortmain in his final bid for power, the London Institute rallies to save her, but is beset by danger and betrayal at every turn.
- ISBN: 9781416975908
- Author: Clare, Cassandra
- Published: 2013 , Margaret K. McElderry Books
- Themes: Kidnapping, London, Orphans, power, Rescues, Secret societies, Supernatural
- Descriptors: England (UK), Fantasy, Young Adult (ages 14-18)
- No. of pages: 496