Propaganda film about Soviet inventor Igor Krymov and his entrapment by foreign spies.
| Actor | Role |
|---|---|
 Yuri DemichIgor Krymov | Igor Krymov |
 Nelli PshyonnayaNora Braun | Nora Braun |
 Leonid SatanovskiyMax Beyn | Max Beyn |
 Konstantin ZheldinVenson | Venson |
 Sergei YakovlevUvarov | Uvarov |
 Viktor FokinNot listed | Not listed |
 Anatoliy RomashinBoris Smolin | Boris Smolin |
 Elza LezhdeyUta | Uta |
 Oleg MokshantsevAleksey Mikhno | Aleksey Mikhno |
 Boris GusakovPavel Zharkov | Pavel Zharkov |
| AAleksandr DikNot listed | Not listed |
 Nikolai MerzlikinNot listed | Not listed |
 Vladimir NovikovNot listed | Not listed |
 Vsevolod PlatovNot listed | Not listed |
 Gleb PlaksinNot listed | Not listed |
 Yevgeniya SabelnikovaNot listed | Not listed |