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Among the reasons that Doris Cole (Hillary Brooke) has left her husband Peter (John McNamara) is that she once awoke to find him standing over her bed, brandishing a knife. Peter insists that he is a chronic sleepwalker and had no idea what he was doing. Even so, when Phillip Kendall (Harry Hickox), an extortionist who has threatened to block the divorce that Peter so desperately wants, is found stabbed to death, Peter is charged with murder. It is up to Perry Mason (Raymond Burr) to prove Cole's innocence--and to reveal the guilty party. This episode is based on a 1936 novel by Perry Mason creator Erle Stanley Gardner)