Actress Brio working in a cafe "The Happy Canary", does not suspect that her new acquaintances Brianski and Lugovec are Communists sent by an underground committee to fight the enemy's counter-intelligence.
| Directing | Lev Kuleshov | Director |
| Writing | Anatoli Marienhof | Writer |
| Writing | Boris Gusman | Writer |
| Crew | Boris Frantsisson | Cinematography |
| Crew | Pyotr Yermolov | Cinematography |