Весёлая канарейка
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.

Galina Kravchenko
Mademoiselle Brio, variety show artist

Andrey Fayt
Lugovets

Ada Vojtsik
Lugovets's wife
Sergei Komarov
Bryanskiy, underground Bolshevik

Yury Vasilchikov
Adjutant for the chief of secret intelligence
Mikhail Doronin
Chief of secret counterintelligence
Vladimir Kochetov
French Bolshevik soldier

Vsevolod Pudovkin
Illusionist

Aleksandr Chistyakov
Worker
Aleksandr Zhutaev

Galina Kravchenko
Mademoiselle Brio, variety show artist

Andrey Fayt
Lugovets

Ada Vojtsik
Lugovets's wife
Sergei Komarov
Bryanskiy, underground Bolshevik

Yury Vasilchikov
Adjutant for the chief of secret intelligence
Mikhail Doronin
Chief of secret counterintelligence
Vladimir Kochetov
French Bolshevik soldier

Vsevolod Pudovkin
Illusionist

Aleksandr Chistyakov
Worker
Aleksandr Zhutaev