The action takes place in the late 1920s Ukraine. Exposing the agent of counterrevolution penetrating the environment of Soviet scientists.
Georgiy Stabovoy
Director
B. Mikhaelis
Olga Patorzhinskaya
Antonin Pankryshev
Prof. Patorzhinskiy - Olga's husband, a wrecker
Sergei Minin
Tsapko - professor
Evgeny Kokhanenko
Nikita Kondratyevich - Khristina's father
Stepan Shagaida
Professor Grabar - Olga's father