 Brandy Kirby (Lizabeth Scott ) and crooked Lawyer Vincent Mailer (Alexander Knox) plan to rob William (Griff Barnett) and Maida McIntyre (Virginia Brissac) by producing a convincing double for their long-lost son. Brandy charms gambler Lefty Farrell (Edmond O Brien) into impersonating the missing son. Kathy (Terry Moore), the McIntyre s niece, who likes Lefty, introduces him to the McIntyres who soon become convinced he is their son, but the old man refuses to change his will. Lefty balks at killing McIntyre and exposes Mailer s attempted swindle. Brandy and Lefty end up together as "two of a kind."