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In Victorian London, fourteen-year-old Modo, a shape-changing hunchback, becomes a secret agent for the Permanent Association, which strives to protect the world from the evil machinations of the Clockwork Guild.

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.