The headmaster of a private girls' school is doing her best to maintain strict discipline in the school. In addition to the loosening morals of the students, the warm relationship between two girls is a causing concern.

Schoolboy Klaus is convicted of theft and sent to prison. At his release Klaus feels that his life has changed a lot. Despite all his hardship and difficulties he keeps up his studies under the supervision of the grim Master Kahari.

Elmeri Vara from the General Stabilization Party, Selma Vuorinen from the Free Enlightenment Party, and Irja Solanen from the Independent Women's Party are competing for seats in parliament. When young Pertti and his classmates start a campaign with caricatures against Vara and Vuorinen, whom they consider unfit, Principal Reino has to decide whether to support the parliamentary candidates or his students, and how he feels about the candidacy of his beloved Irja.

Timo learns about his grandfather Santeri's background in the workers' sports movement. Inspired by this, he begins to encourage his alcoholic father to practice his own sport, javelin throwing.

A rich widow is found dead in her apartment in Helsinki due to gas poisoning. The incident is initially thought to be an accident, but inspector Palmu notices that the murderer made a mistake, and so Palmu, Kokki and Virta begin the investigation: who had come to the apartment through the balcony door and opened the gas tap while Mrs. Skrof was asleep?