Paris, 1955. Fraudster Georges de Valera, hiding from the police, with the help of a correspondent for the reactionary newspaper Sibilo, poses as Minister Dubov, who allegedly escaped from the Soviet Union. Sibilo's daughter explains to Georges the purpose of the planned action: to slander progressive journalists with the help of the false Dubov. De Valera, not wanting to become a participant in the provocation, goes into hiding. But instead they find another candidate for the role of Dubov....