Intelligence officer Sergei arrives in Berlin to establish contact with the staff of the General Staff and the Ministry of Foreign Affairs of Germany under the name of the Hungarian Baron Perenyi de Kiralgaze. He finds those who, not accepting the ideas of nascent fascism, seek connections with the USSR. Having met the Gestapo Doris Scherer, who dreams of marrying a Hungarian aristocrat, Sergei transmits the first information about military orders to his homeland... The film is based on real events that took place in Germany in the 30s.