Alfred Hitchcock had already begun work on REAR WINDOW when he took on the project to direct DIAL M FOR MURDER, based on the successful play by Frederick Knott. For the film, Hitchcock chose to cast his favorite leading lady of the time, Grace Kelly, as the embattled Margot Wendice. Kelly would also star in REAR WINDOW and Hitchcock's subsequent TO CATCH A THIEF. It wasn't Hitchcock's preference to shoot DIAL M FOR MURDER in Warnercolor 3D (the cameras were large and unwieldly), and the film is seldom screened in 3D, but Hitchcock's use of the technique is notable for its service to the story rather than just being a gimmick. In the film 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 go...