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Paul Drake (William Hopper) is hired to keep an eye on a lonely-hearts classified ad placed by heiress Marilyn Cartwright (Kathleen Crowley). No, Marilyn isn't looking for love: she's looking for con artist "Country Boy" Barnaby (L.Q. Jones), the man who drove her sister to suicide. All Marilyn wants to do is trap Barnaby into exposing himself as a crook--but when he turns up murdered, she finds herself accused of the crime. Inevitably, Perry Mason (Raymond Burr) is brought in to prove the girl's innocence. This episode is based on a 1948 novel by Perry Mason creator Erle Stanley Gardner.