At the end of the Second World War, Fedor is demobilized and returns home where he meets a homeless boy, small Fedor. They decide to live together. The adult works in the building trade and the boy goes to school and looks after the house. They get on very well until Natacha arrives in big Fedor's life. After marrying big Fedor, Natacha tries to win the child's love. But he remains hostile.

Three boys live in the same house and go to the same school in Kiev. After one of the boys gets in trouble, their friendship is put to a serious test for the first time in their lives.