A unique time travel device connects two worlds. In one of them — the world of the future — a global nuclear war has taken place, and the remnants of civilization are trying to survive in bunkers and shelters, desperately fighting over the last scraps of food and fuel. And the world of 1941, where the Great Patriotic War is raging and the troops of Nazi Germany stand at the gates of Moscow. What will people do — people who have lost their world and their hope and have gained access to the world of the past? Some will try to play God, using the achievements of modern technology, while others will fight side by side with their ancestors against the enemy that has attacked their Homeland.