The film follows a dress rehearsal of a charity concert.

A film centered around a popular Finnish song book. Young lovers Pirkko and Pekka break off their engagement at the end of an evening spent at a dance restaurant. At home, Pirkko finds a songbook in her room, whose songs turn into musical scenes. The night watchman carries the songbook with him, and it ends up, via a sad prostitute, a police officer, and a night shelter resident, with Pekka, who is waiting for Pirkko's forgiveness and comes to pick up his fiancée.

Paavo and Eeva, two young people who have moved from the countryside to the city, meet a gang led by Kalle, who spend their time loitering and committing petty crimes. A fateful evening on a motorboat irrevocably changes the young people's lives.