There is a severe housing shortage in Copenhagen. Eva and Harry both respond to the same rental advertisement. The landlord, Baldrian, believes they are married, which is why they can have the apartment. Baldrian does not want to rent to single people. Therefore, Eva and Harry decide to pretend to be a married couple. Meanwhile, Harry's fiancée Lise is on her way to Oslo, where she will be staying for a few months. On the way, she meets the charming John. Eva and Harry fall in love and get married. But then Lise announces her arrival in Copenhagen. She has since married John and wants an apartment in Copenhagen.