This year is 1935. The Nazi Party has already come to power in Germany, but in the USSR no one is expecting war yet. In a provincial town, a teenage slut and thief, Olga Streltsova, wakes up from a blow to the head to discover that her consciousness is now merged with the consciousness of another person. A man from the future, a radio engineer who was interested in military history, tactics and weapons. She knows for sure that the Red Army anti-aircraft guns cannot cause serious damage to the Junkers, and the tank forces are not provided with spare parts. To achieve her goal, Olga is ready to go over her head. Is the new Joan of Arc capable of changing the course of history and saving at least 15 million of those who died during the great war? She only has six years to try it.