A lawyer comes up with a devious plan to kill his half sister and frame another man for the crime.

Erik Dahl escapes from prison where he is serving a sentence for smuggling. He seeks out his family, but the police have already been there, and he will have to flee. Erik alters their appearance and start a new life as fishmonger in a small town, but he plans to leave the country...

Cleaning lady Lilly Hansen finds her employer, managing director Martinsen, with a knife in his back. The police is summoned and Chief Inspector Bakker is put on the case, despite suffering from the flu. When he arrives at the scene, the body is gone, to Lilly Hansen's dismay. Shortly after a body is found in nearby Palace Park...