The celebrated actor George Bergmann has four divorces behind him. When his four former wives get the impression that he is cozying up to a very young actress, they feel that they must take action. However, this leads to various misunderstandings and complications, which partly involves the former wives' new men and partly the young girl's strict parents.

"Naalen" is the title character in the film, a ruthless black market kingpin whose wake inevitably follows a series of other crimes. How "Naalen" got his strange nickname will not be revealed here, but it can be hinted that it has a close connection to the precious and rare commodity he deals in his "business": insulin.

Three girls (around 20 years old) who have grown up in different parts of Denmark get a strange letter. It turns out they are sisters, and will inherit from their late mother, if the can stay together one month in the same house. They end up in a lot of (romantic) trouble, because of speculations of who their father(s) might be.

The painter Jørgen has talent but no luck. His upstairs neighbor is a ballet dancer and may not have much talent, but she does have good luck. Director Bang promises her that he will support her theater if she takes the lead role herself. Else is not particularly enthusiastic about the arrangement and Bang's courtship. Jørgen also has his eye on the beautiful girl, but is too shy to speak out. He's not happy about the development either.

At the dinner for their school's 100th anniversary, three old schoolmates meet. All three have done well in life, for Eyvind is now a respected judge, Herluf the stern director of a glassworks and Ove the owner of a printing house. In the time after the dinner, the coincidences of the three men's lives will become entangled in a way none of them could have foreseen. Fortunately, they still have their old principal in the background to pull the strings.

Ella and Olaf are in love but childless. Their neighbors Viggo and Polly have three children, but their marriage is in ruins. When Ella and Viggo happen to be alone on a motorboat, she gives in to his advances and becomes pregnant. Ella conceals the circumstances, but when her daughter is seriously injured, only Viggo can be used as a blood donor.

Dr. med. Peter Lind is a young, partying model doctor who, despite an extensive and wealthy female clientele, is getting tired of the monotony of medical life and is therefore planning to go on a long trip abroad to experience adventure. His wife Vera is very unhappy with this plan. Peter and Vera have recently divorced after four years of marriage and are therefore better off than ever. Since they cannot agree on whether Peter should travel or not, they choose fashion writer and theater critic Martin Steen as their umpire.

Detective Peter Smeth and his young and charming wife, Louise, visit Magasin Heiberg, where, at his wife's express request, he is to buy himself a new hat. He is not amused by the idea, but there is no getting out of it. Suddenly, however, an event occurs that causes the couple to change their minds. The daughter of the store's owner, Inge Heiberg, is found unconscious in the store's courtyard, and Peter and Louise rush to her aid. The fainting spell turns out to be shrouded in mystery.

Depiction of the social democratic activist and politician Peter Sabroe, who in the time around the turn of the century went to fight for the oppressed, oppressed and abused existences.

During World War I, the engineer Torben returns home with secret papers from the Russian Tsar to the courier Tuschin, Torben's best friend. Tuschin is found murdered, however, and to solve the murder, Torben stays at his hotel. Here he meets several mysterious people, not least the breathtaking stenographer Inge. But in the hotel, no one is who they pretend to be.