Ex-gangster Johnny Allegro makes the acquaintance of the beautiful Glenda Chapman when he helps her out of a tight spot. As a result, a Government agent persuades Allegro to exploit his new contact to go undercover and infiltrate a crime ring led by Glenda's husband, Morgan Vallin. Allegro achieves his objective, arriving at an island owned by Vallin, but realizes quickly that Vallin is a formidable opponent with a disturbing hobby.
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