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After accusing his wife Myrna (June Dayton) of trying to poison him, Ed Davenport (John Stephenson) dies in a motel room. Worse still, Ed has written a letter, implicating his wife in his death. By the time the police arrive, both corpse and letter have disappeared, but some arsenic-spiked candy is found on the scene--evidence enough to charge Myrna with murder when Ed's body is finally recovered. Faced with what seems to be an open-and-shut case, Perry Mason (Raymond Burr) must perform some spectacular legal calisthenics to save Myrna from execution. This episode is based on a 1954 novel by Perry Mason creator Erle Stanley Gardner.