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...

Batmanova, once a serf, sets Paris aflame with her singing and now returns to the court of the Prince in 19th-century Russia. The Prince wants Batmanova for himself, but she loves a young nobleman who is technically still a serf because his papers have been lost.