Engineer-designer of the Moscow aviation plant Cochin took the secret blueprints home. He didn't know that foreign intelligence had long been hunting for these blueprints...
| Actor | Role |
|---|---|
 Mikhail ZharovLartsev | Lartsev |
 Nikolai DorokhinKochin | Kochin |
 Lyubov OrlovaKseniya Lebedeva | Kseniya Lebedeva |
 Faina RanevskayaNot listed | Not listed |
 Leonid KmitNot listed | Not listed |
 Boris PetkerNot listed | Not listed |
 Sergey NikonovLavrenko | Lavrenko |
 Vakhtang TumanovEngineer (uncredited) | Engineer (uncredited) |
| BBoris SvobodaTriviosh | Triviosh |