The plot is based on genuine events: a tendency to abandon subversive activities and surrender of one of the leaders of the Ukrainian counter-revolutionary underground, coroner general Y. Tyutyunnik. The young Chekist Sashko Kovalchuk infiltrates the Kiev counter-revolutionary underground.
| Actor | Role |
|---|---|
 Aleksandr SolovyovNot listed | Not listed |
 Ivan MykolaichukNot listed | Not listed |
 Kostiantyn StepankovNot listed | Not listed |
 Volodymyr VolkovNikolai Ivanovich Gubar | Nikolai Ivanovich Gubar |
 Olga KuznetsovaNot listed | Not listed |
 Alexander DemyanenkoNot listed | Not listed |
 Viktor PavlovNot listed | Not listed |
 Yuriy RudchenkoNot listed | Not listed |
 Yuri DedovichNot listed | Not listed |
 Alla BudnitskayaNot listed | Not listed |
| VViktor KonisevichNot listed | Not listed |
 Vatslav DvorzhetskyNot listed | Not listed |
 Rayisa NedashkivskaNot listed | Not listed |