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.
Leonid Kharonsky, Nikolay Ashikhmin, Pavel Luspekayev, Nikolay Kryuchkov, Leonid Kharitonov, Alevtina Rumyantseva