One evening, the bell rings at Commissioner Maigret's house. Minister of Construction Puan asks the commissioner to come to his apartment urgently, keeping this request a secret from the police authorities. At the meeting, it turns out that a report disappeared from the minister's apartment, with which Puan was supposed to speak at a government meeting two days later.

The action of the epic film takes place in the second half of World War II. The plot focuses on the liberation of European countries from German occupation and the anti-fascist activities of the communist parties of these countries. After the victory at Stalingrad, a decisive turn occurred during the war. The main aim is the rallying of all patriotic forces, the creation of a national anti-fascist front in the struggling countries. The swift offensive of the Soviet troops, problems with the opening of a second front, major operations and the offensive of the Soviet army lead to the liberation of Europe. Rebellions are rising in different countries - such as the heroic uprising in Warsaw, in Slovenia, Bucharest and other cities. Brave heroes who performed immortal feats in the name of the happiness of mankind and freedom.