Arinka, a young girl who lives near the railroad, discovers a ring of spies who are preparing the terror act.
| Actor | Role |
|---|---|
 Larisa YemelyantsevaArinka | Arinka |
 Pavel SukhanovNot listed | Not listed |
 Mariya BarabanovaNot listed | Not listed |
 Sergei FilippovNot listed | Not listed |
 Nikolai KonovalovNot listed | Not listed |
 Georgy OrlovRailroad master | Railroad master |
 Nikolay UrvantsovCashier | Cashier |
 Aleksei MatovFriend of Stepan Stepanovich | Friend of Stepan Stepanovich |
 Aleksandr KulakovMachinist Vasiliy Sergeyev | Machinist Vasiliy Sergeyev |