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Nancy Banks (Joyce Bulifant) may not be too bright, but she is intensely loyal. Finding it impossible to believe that her brother Rodney (Dick Davalos) embezzled from his job to gamble at the race track, Nancy sets about to help Rodney in any way she can. Could it be that Nancy's zeal has resulted in the murder of Rodney's former boss Marvin Fremont (Arch Johnson)? That is what the police believe, and that is what Perry Mason (Raymond Burr) must disprove in court. This episode is based on a novel by Perry Mason creator Erle Stanley Gardner).