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.
Mademoiselle Brio, variety show artist
Lugovets
Lugovets's wife
Bryanskiy, underground Bolshevik
Adjutant for the chief of secret intelligence
Chief of secret counterintelligence
French Bolshevik soldier
Illusionist
Worker
(uncredited)
