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In Victorian-era London, a series of murders in which the victims are mutilated and burnt have led to rumours of Spring Heeled Jack, a clawed demon who is able to leap buildings in a single bound. Police are stumped by the murders and call in a young Arthur Conan Doyle to act as consulting detective. After his investigation turns up trumps he requests the assistance of his mentor Joseph Bell, an aloof but brilliant investigative mind, to take over the case.