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.
Dr. Aitamaa is spending holiday with his family at their summer villa. He accidentally reads a letter that was meant to his wife. The letter is from another man. Aitamaa follows his wife to the city and finds out that she has a lover. Later the wife is found killed and Aitamaa becomes the prime suspect.