A card cheat is threatened with exposure into joining a criminal enterprise that Sherlock Holmes believes is controlled by Professor Moriarity.

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Main Cast: Arthur Wontner, Ian Fleming, Minnie Rayner, Leslie Perrins, Jane Welsh, Norman McKinnel, William Fazan, Sydney King, Philip Hewland, Gordon Begg

Director: Leslie S. Hiscott

Writers: Arthur Conan Doyle, Cyril Twyford

Editor: Jack Harris

Cinematographer: Sydney Blythe

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