As three women head off on a boating trip with a group of children, they receive a letter written by a woman claiming to have stolen one of their husbands. Which one? The letter doesn't say. Faced with the prospect of a shattered life, each woman soul searches throughout the day: Deborah Bishop (Jeanne Crain) feels inadequate amidst her husband's (Jeffrey Lynn) country club set. Everyone sees Lora Mae Hollingsway (Linda Darnell) as a gold digger, including her husband (Paul Douglas). And Rita Phipps (Ann Sothern) has a career that makes her husband (Kirk Douglas) feel neglected to the point of infidelity. All three endure the anguish of uncertainty until the boat trip ends - and the truth is revealed.