The main character is Viktor Shtrum, a talented Soviet physicist who refuses to blindly follow his "comrades" by signing false documents and becoming a tool in the hands of an all-powerful state. During the war, Shtrum’s mother, Anna Petrovna, was sent to a concentration camp, but her letters continued to arrive for many years and help him remain more moral than those around him.
| Actor | Role |
|---|---|
 Sergey KuryshevNot listed | Not listed |
 Tatyana ShestakovaNot listed | Not listed |
 Elizaveta BoyarskayaNot listed | Not listed |
 Igor IvanovNot listed | Not listed |
 Stanislav NikolskiNot listed | Not listed |
 Oleg DmitriyevNot listed | Not listed |
| OOleg GayanovNot listed | Not listed |
 Andrey KondratyevNot listed | Not listed |
| NNikita SidorovNot listed | Not listed |