In a boarding house in the inner city lives Flora - a fresh Copenhagen girl with a burning dream: She wants to be a journalist. Accompanied by loud gramophone music, the typewriter clatters far into the night. But it is not easy to sell stories to the busy press, and Flora has only one last idea that can secure the rent: An interview with shipowner Olivarius, who has bought a precious Chinese statuette. But nothing goes as Flora expects, and soon she is on the hunt for a dramatic robbery story and - not least - in love with the suspected thief!

Under the city's roofs, life goes on in a motley manner. It alternates with tears and smiles, with happiness and sadness. In the artist restaurant "Mona Bar" in the inner city, the former model Mona Frank acts as the goddess of artists. She helps with both money and heartache. Among the many artists, Niels Brandemose has his own face. He has recently come to the city to attend the Academy, and his whole desire and desire is to become a painter.

When waiter Thomas Hansen has put aside 10-øre on 10-øre to become a hotel owner, you can clearly see that the spirit has changed. It is not enough, by the way. Therefore, Thomas borrows the missing 10,000 kr. from a guest, rentier Birkehøj, who remarks that he can always get those shillings back when Thomas has become a millionaire. But, for the record, Thomas writes him a receipt on the back of a sandwich note. Then Thomas starts building his hotel - and then Birkehøj dies. Thomas' entire fortune is eaten up by smart money men, and he ends up as a farmhand. He only gets a job again when a maid is laid off. Thomas becomes a housekeeper, and in his new job he encounters justice. A hotel owner Ravn from Ringkøbing shows up as a guest in the house.

The story about Mr. Petit - a French charming marriage trickster and murderer of women.

"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.

We follow two randomly selected destinies: two young girls whose data could have been taken straight from the police files, which contain so many human documents—many sad, but also many joyful, because a large proportion of those who were initially weak and frivolous are saved from the temptations of the big city.

Although Danish-American George Steffenson comes from poor circumstances, he has built a large financial empire, where the money rolls in. But the busy life is wearing on George, and when no medicine helps, he goes to Denmark on vacation, where no one knows him and he may find the true values ​​of life. But it is no easy matter to turn your back on the empire, while sneaky backers are making insidious plans.

Baldur Justesen is the owner of an ice cream parlor in a Copenhagen suburb. He is a smooth and unassuming man who works hard to keep it running. It is not quite that easy. He has a beautiful, young wife, Sonja, who likes to dress nicely. A man who works all day in an ice cream parlor can also need some diversion, and it is Baldur Justesen's greatest joy to sing in the choir of the "Lyren" singing association.

Architect William Sommer wants to organize his life in a practical and sensible way. Yet it is falling apart. His ex-wife will not settle for a check. His new, young girlfriend has a young man in tow. William feels sick to his stomach. He numbs the pain with alcohol. He feels like doing something violent. The nice man is about to explode...