Gynecologist David Erneman and his wife Marianne have been married 15 years. Before their marriage, Marianne had been engaged to an artist, Carl-Adam, David's best friend.

David is having a summer affair with Suzanne. Marianne is unhappy and leaves for Copenhagen to renew her friendship with Carl-Adam. But David is tired of his mistress and wants nothing better than to return to his wife. He finds out which train Marianne is taking and arranges to get on the same one, while his chauffeur drives to Copenhagen.

David and Marianne meet on the train, and a series of flashbacks reveal scenes of their life together. They meet Carl-Adam in Malmö, and travel to Copenhagen together. In a night-club, Carl-Adam arranges wiht a young girl to fall all over David. In a fit of jealousy Marianne attacks the girl, then leaves. Sam the chauffeur is waiting outside, according to plan, and he drives David and Marianne to a nearby hotel to begin their second honeymoon.

"Understandably impressed by their Tracy/Hepburn-style bantering in Waiting Women, Bergman wrote Björnstrand and Dahlbeck a vehicle of their own. Structurally, it plays a trick on the audience, for we don't immediately twig that the two are playing a married couple. He's a top gynaecologist drifting into an affair with patient Lombard. Her response is to dash off to Copenhagen to the arms of rough-hewn sculptor Grönberg, her one-time fiancé. Proceedings span the broadly farcical (a nightclub brawl helps clear the air between the combatants) and the subtly insightful (Björnstrand's lunch with rebellious teenage daughter Andersson helps him realize how much he's become disengaged from his own family). Eventually self-knowledge and acceptance help the sexes bridge their differences. A minor but mostly agreeable picture, which finds Bergman gearing up for his altogether more resonant exercise in wise comedy, Smiles of a Summer Night."

"The whole job was entirely frivolous. And that's just what's so good about the film, I suppose—its complete frivolity....It was only made for the passing moment."

"That's just a divertissement....I had just divorced my third wife, though I still liked her very much, and, therefore, began writing about her. In fourteen days I finished the script, and fourteen days later we began shooting the picture. The whole thing was just for fun—and money."

David Parkinson: "Film Notes"