Our time. A world in which Russia lost the Great Patriotic War. As a result, the totalitarian Nazi regime was not defeated and almost the entire world was conquered by Germany. But by the will of fate, the main character Yuri Cherkasov is transported to the past. Finding himself in the body of his grandfather, a lieutenant in the Red Army, he takes part in the events of the “winter war” with Finland. The harsh realities of war - blood, cruelty, cynicism - do not frighten him. Now he is the only chance of the world's future for a life without slavery and violence. But can one single person change history?