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When Margy Clune wins first prize in the Lucky Legs contest, she is delighted because the money will allow her to marry Dr. Bob Doray. To her surprise, Bob is upset by the fact that she has displayed her legs to everyone in town. Before she can collect her winnings, however, Frank Patton, the promoter of the contest, leaves town with all the money and Margy goes after him. Mr. Bradbury, the owner of the department store where Margy is a model, travels to San Francisco to ask for the help of lawyer Perry Mason. Mason's detective, Spudsy Drake, locates Patton, and Perry pays him a visit. While he is waiting for the elevator in Patton's building, Perry sees Margy sneaking down the stairs. Upstairs, Perry finds Patton's body. Investigating an address on Patton's desk, Perry discovers that Margy is staying with Thelma Bell, another of Patton's victims. Margy admits she was in Patton's apartment but insists that he was already dead when she got there. Perry tricks Thelma into confessing that she was in the apartment when Patton was killed, but she claims he was killed by a man. Because Patton was murdered with a surgical knife, the police suspect Bob, but Perry reveals that the real murderer is Bradbury, who was in love with Margy and stole the scalpel from Bob's car in order to frame him.