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While on a fishing trip, Perry Mason (Raymond Burr) and Paul Drake (William Hopper) reel in a most unusual "catch": a beautiful girl named Sally Fenner (Peggy Castle), who had jumped into the ocean while fleeing a pack of guard dogs on the island estate of George Alder (David Lewis). Naturally, Alder turns up murdered, and Sally is charged with the crime. Assuming Sally's defense in court, Perry finds that there is no shortage of people who would liked to have seen Alder dead--including someone who was very, very close to him. This episode is based on a 1950 novel by Perry Mason creator Erle Stanley Gardner, and would be refilmed in 1965 as "he Case of the Impetuous Imp".