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.
A young milkmaid Liza becomes an outcast of society in one of the Kuban collective farms. An honest and hardworking girl finds protection from the brave and sensitive party organizer Prokhor, who stood up for her.
