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As Thaniel, a wych-hunter, and Cathaline, his friend and mentor, try to destroy the terrible creatures that infest the alleys of London's Old Quarter, their lives become entwined with that of Alaizabel Cray, a woman who may be either mad or possessed.

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.