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Based on a stage play by Edgar Wallace, The Old Man is nowhere near as benign as its title. The eponymous character is a mysterious, never-seen criminal mastermind, who specializes in bumping off other criminals. Scotland Yard traces the Old Man to a rustic inn, where the villain could be anybody -- even one of the female guests! When a blackmailer preying upon Lady Arranways (Anne Grey) is murdered, everyone is placed under suspicion, but eventually the Old Man tips his hand and meets a grim demise. Oddly enough, it isn't the Law who brings the Old Man to justice, but comic-relief servant Mrs. Harris, played by the inimitable cockney comedienne Maisie Gay.