A Red Army officer Polevoy possesses a navy dirk with a secret message encrypted in its handle. The second part of a message belongs to a White army officer Nikitskiy. It's up to three young friends of Polevoy to uncover the mystery.

Avdey, the husband of the tractor forewoman Fedosya leaves her for another woman. Their 18-year-old son Filipp can not forgive his father and on the day of the new wedding even tries to run over a tractor car in which the father is driving with a new wife. Shortly after the wedding, Avdey realizes that he made a fatal mistake and is trying to return to Fedosya, but she cannot forgive. Filipp was taken into the army, on the border where Filipp serves, an armed violation of the border occurs, during which he dies.

A story about the beginning of life. Having lost their parents early, Alyosha and Nadya were not left alone - the father’s friend and the people around them helped the children remain kind and open in this difficult world of adults ...