From nasty murders among the Frisians in the north. In the harbor of Neuharlingersiel, the head of the shrimp peeling factory is found dead. The investigators quickly conclude that Hauke Matthiesen committed the murder out of jealousy. However, Hauke's friends—village policeman Rudi, the good-natured postman Henner, and his new neighbor, teacher Rosa—refuse to believe this. They are convinced that the Wittmund criminal police have the wrong person. And since no one is listening to them, they roll up their sleeves and start their own investigation. With their own methods.