Summer 1942. A fierce battle begins near Stalingrad, the outcome of which will decide the fate of the whole world. Twenty-year-old sergeant Lyubomir Zukh, who has not yet sniffed gunpowder, left his unit in the front-line zone to say goodbye to his girlfriend. He was away from the unit for only three hours. But according to the laws of the military time he is a deserter. And the punishment for this alone is execution. The sentence is too harsh, and everyone understands this. Will the flywheel of the military machine stop, will there be a pardon order?

Wounded as a tank driver in 1941 during WWII, Kalashnikov sees the latest Soviet machine gun fail. As he's also an inventor, he starts looking for improvements and in 1947 ends up with AK-47 assault rifle.