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Convicted murderer Hal Wilson (Chester Morris) escapes from prison with the aid of his gang and breaks into the home of psychologist Dr. Shelby (Ralph Bellamy) to take refuge from the police. Shelby and his family are entertaining guests, all of whom become Wilson's hostages. After Wilson kills one of Shelby's young medical students, the doctor determines to save the others by analyzing Wilson, to make him understand the reasons behind the odd paralysis in one hand and his violent behavior. Wikipedia