It Walks By Night by John Dickson Carr

A tense, atmospheric mystery in which a string of baffling nocturnal deaths—apparently the work of some uncanny presence that moves unseen at night—terrifies a community and confounds the police; as suspicion, superstition, and fear mount, a determined investigator peels away the layers of deception and misdirection to expose the human cunning and motive behind the seemingly supernatural crimes.

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