Shopgirl Mary Brown (Irene Dunne) and newspaperman Rollo Porter (Pat O'Brien) agree "It's a swell night for a cry." When they meet after their respective sweethearts marry others, all they seek is a convenient shoulder for consolation. Drawn together by a sense of humor and shared losses, Mary and Rollo wed in an "open marriage" -- an arrangement not binding each other for life but as cozy comfort against being alone. Pitfalls arise: the arrival of a baby girl and regular reminders of those past loves -- particularly when both former flames (blonde socialite Myrna Loy and disillusioned pianist Lester Vail) return on the Porters' wedding anniversary. What wins out: temptation elsewhere or treasure at hand?