Dial M for Murder

Margot Wendice is a wealthy heiress whose playboy husband, Tony (Ray Milland), recognizes his dependence on his wife's fortune. When Tony begins to suspect he is losing Margot's affection to writer Mark Halliday (Robert Cummings), he also begins to fear he will lose her wealth. This leads the callous husband to craft a plan for his wife's death. However, when the plan goes awry, Tony is quick to turn circumstance into a second opportunity to destroy his wife. (official distributor synopsis)