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Set in England, The Fatal Mistake stars Arthur Hill as a respectable accountant and family man. Every month on the dot, Hill is visited by his "friend" Roddy McDowell, who graciously bestows gifts upon Hill's wife and children, then retires with his host into the den. Here McDowell collects his monthly blackmail check--just as he does with all his other "clients". Tired of paying out extortion, Hill plans a neat little mishap for McDowell. Fatal Mistake was a 60-minute offering of Bob Hope Chrysler Theatre's 1966-67 season.