Relations between Sweden and Finland come to near breaking point. When further negotiations led by President Mara fail, Sergeant Körmy interferes in the course of events.
Uuno Turhapuro becomes the President of Finland. Streets are named after him and honorary companies are arranged for him. He also tries to turn Finland into a kingdom.
Ilona, a young elementary school teacher, arrives in Hämäläiskylä . He and Aarne, the host of Niskavuori, who is frustrated with his marriage, fall in love. The relationship becomes a public secret. Aarne's wife Martta, who owns half of Niskavuori, wants to hold on to her husband until the last. For Liskisa, the matriarch of Niskavuori, the most important thing is the reputation and honor of the family.
The main character is a miller, who sometimes acts strangely but is otherwise a goodhearted hardworking honest man. He sometimes keeps the villagers up all night by howling. Finally the villagers decide that the miller has to be committed into a mental hospital, where the hero does not have to spend too much time until he escapes. The miller takes to the woods near his home but there he is constantly harassed by the chief of the police with his posse.
