Borja and Seva live on the bank of the Dnieper. In summer, during vacations, they help adults by delivering letters. Suddenly they learn that a poacher has appeared in the village. The boys start their own investigation.

The film was set in Russia during World War II and is about a 5 year old girl searching for her partisan leader father while escaping from the Nazis. Nazis, trying to catch 5 years old girl to make her their hostage, because her father is the Soviet partisan commander, and young boy trying to save her. For some time, when little baby was lost in the forest alone or when Nazis finally caught two children your hope is almost broken.

On the outskirts of the provincial town, Yevdokim and Yevdokiya live, raising foster children. Yevdokim works at a factory, Yevdokiya is a housewife. The family seems to be safe and happy: the only trouble is that Yevdokiya cannot forget the love of her youth. This Yevdokim cannot stand and offers Yevdokiya freedom, while he will remain with the children. But all these contradictions are drowned in mutual love for children and for each other.