For centuries, humanity has fantasized about the invasion of the Earth by demonic hordes and bloodthirsty aliens. And during this time, the opinion has already become commonplace that the most terrible of the invented monsters, the most dangerous predator of all, is man himself. However, even in incredible dreams, people did not dream that one day they would literally have to fight this most serious enemy - their mirror image. Pilot Stas Nuzhny, on a transport shuttle, finds himself in a spatial anomaly, which turns out to be a gate between two alternative universes inhabited by people. A confrontation between two humanity begins: first ideological, and then armed. Armadas of ships collide in space battles, paratroopers occupy planets, people peer into the sky with panic. But the real nightmare of the fight with the mirror is ahead...