Years of Bolshevik coup. A Soviet plane crashed in one of the sectors of the western front. Before his death, pilot Peluzin managed to reveal the secret of his invention to air observer Andrei. The dying man asked him to finish what he had started — to build an aviation oil engine. After a long search, Andrei managed to find the blueprints, which Peluzin's former flight engineer, Bogdan, was also hunting for...

The NEP era. Two families with the same surname, Ivanov, live in Leningrad. They are visited by American relatives, who turn out to be confused. Ivanov the draughtsman's unsuccessful plan to rob the American is replaced by cooperation, as a result of which the American finds a job at Volkhovstroy and decides to stay in the USSR.

Screen version of a mass performance held on November 7, 1920 on Palace Square with the participation of Proletkult artists and a crowd of several thousand people. The performance reproduced the events of the October coup d'état. Two platforms were built on Palace Square - "white" and "red".