It seemed like a normal shift at the camp, but then a fog fell on Sovenok. In that fog live terrible monsters, one look at whom drives people crazy. After 42 days from the beginning of this hell, Semyon, together with a small group of survivors, with the last of their strength fights for their lives not only with creatures from the fog, but also with once ordinary pioneers, who by the will of the situation became cruel bandits or crazy psychopaths.