On an Earth-like planet, at an altitude of over 7,000 meters, lies the Demarkacia, a protective wall that separates the territory of two hostile races, the Velikiistok and the Jeretiks. In Bunker Number 37, young soldier Aleksi Stassik observes the enemy mountainside and waits for the offensive. However, what he does not know is that high above him in the mountains, a far more dangerous enemy is lurking, with whom Aleksi will soon make acquaintance. Christophe Bec once again demonstrates his talent for thrillingly told science fiction thrillers.