The actor Ralph Gregor plays "Casanova" on the stage and everyone expects, that he also lives out the role in real life. Johanna Brinkmann, known as "Joe", tries everything to make her husband jealous of Ralph. Ralph, however, is actually dating his colleague Steffie. After a fight with her, he takes off on a short trip into the countryside and there gets to know the attractive Gertrude, with whom he falls in love. In short order, he proposes to and marries her. Soon, however, Gertude gets to know Steffie and Joe, who appear to know Ralph much better than they do, and Gertrude loses it.