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.
| Actor | Role |
|---|---|
| LLeonid KharonskySevka | Sevka |
| NNikolay AshikhminBoris | Boris |
 Pavel LuspekayevStepan (shofyor gruzovika) | Stepan (shofyor gruzovika) |
 Nikolay KryuchkovIvan Zakharovich (major militsii, otets Borisa) | Ivan Zakharovich (major militsii, otets Borisa) |
 Leonid KharitonovValka (kapitan rechnogo buksira) | Valka (kapitan rechnogo buksira) |
 Alevtina RumyantsevaPolina Ivanovna (mama Sevki) | Polina Ivanovna (mama Sevki) |
 Anatoliy Solovyovpapa Sevki | papa Sevki |
 Emmanuil GellerPastukh zavyazavshiy s alkogolem | Pastukh zavyazavshiy s alkogolem |
 Vladimir Gulyaevinspektor rybnadzora | inspektor rybnadzora |
 Mikhail ZiminVizunov | Vizunov |
| RR. BoveNot listed | Not listed |
 Marina Kuznetsovaдевочка | девочка |