Marilyn Monroe's a shameless hussy who wears skin-tight sweaters and flirts with anybody in long pants. Joseph Cotten's her long-suffering husband who, nonetheless, remains obsessed with her. On a vacation trip to Niagara Falls, everything unravels: Marilyn and her lover plot to kill Cotten by flinging him over the falls, but their plan goes awry in this fine noirish thriller. This time around, Marilyn even sings!