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On-the-lam prisoner Gruesome (Boris Karloff) uses toxic gas to pull off a bank heist. Eyewitness to the crime is Tess Truehart (Anne Gwynne), who calls on police Detective Dick Tracy (Ralph Byrd) to investigate. With few leads from the bank's incapacitated customers, and press coverage threatening to create chaos, the crime fighter is in a tough spot. When Tracy learns about the mysterious disappearance of a doctor, however, it may provide the crucial break he needs to solve the crime. Wikipedia