Bolshevik Foma Korshunov returns to his village. Soon his son, seven-year old Mishka gets a new nickname - "little communist". When bandits come to the village Mishka, knowing that the reds are close, saddles his horse and hurry to warn them about the danger.

Rodka Gulyaev is a pupil of the Gumniskii rural secondary school. One day on the bank of the river he digs out the darkened old icon. Unfortunately for him his grandmother Avdotya, an overbearing and cunning old woman, spreads a rumor that the icon is miraculous, and her grandson is a saint.

During the Winter War three Soviet soldiers perform a risky recon mission.

After graduation, Nadia Kulagina comes to work in a school where she once studied. After her appearance, the most hopeless student Dimka Lopatin, who was even wanted to be expelled from school, becomes one of the best students and a faithful friend of the new class teacher.