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Magnum (Tom Selleck) comes to the aid of the LaSalle sisters (Mildred Natwick, Martha Scott), a pair of seemingly helpless little old ladies who are about to be evicted by a nasty slum lord. At the same time, he continues his search for the person who has been systematically robbing the Day-N-Dark convenience stores. It is only after Higgins (John Hillerman, who'd known and loved the LaSalles in their show-business days, organizes a charity bingo game on the ladies' behalf that Magnum begins to discern a link between the elderly "girls" and the robberies. And how does ex-ballplayer Johnny Wells (John McLiam) figure into all this?