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Housekeeper Nellie Conway (Joan Lovejoy) tells Perry Mason (Raymond Burr) that she thinks her boss Newton Bain (Harry Townes) is planning to kill his invalid wife Elizabeth (Shirley Mitchell). Investigating the situation, Perry finds that Mary may not be playing with a full deck. Later on, Elizabeth is indeed murdered--but it is Mary Douglas (Nancy Gates) who is charged with the crime. Comedian Jerry Van Dyke plays a rare dramatic role in this episode, which is based on Erle Stanley Gardner's 1951 "Perry Mason" novel The Case of the Fiery Fingers (previously filmed under its original title during Season One).