In this chic comedy adapted from Noel Coward's stage play, two Americans sharing a flat in Paris, playwright Tom Chambers (Fredric March) and painter George Curtis (Gary Cooper), both fall for free-spirited Gilda Farrell (Miriam Hopkins). When she can't make up her mind which one of them she prefers, she proposes a "gentleman's agreement": She will move in with them as a friend and critic of their work, but will not have a relationship with either of them. But when Tom goes to London to supervise a production of one of his plays, leaving Gilda alone with George, how long will this gentleman's agreement last?