Dog-men. Wolf-men. People, who — by a wild whim of nature — came not from monkeys, but from dogs. People who are not people in the usual sense. They underwent bio-correction as far back as two hundred years ago, neutralizing the oldest wolf instinct in the world — the instinct to hunt and kill. But perhaps not everyone went through it… In Siberian taiga, a whole group was discovered that still retained the instinct. Murder after murder. Everyone is in panic. But special agents, who have perfectly mastered the psychology of predators, follow the trail of those in whom “wolf nature” manifests. A small Siberian town, Alzamay, becomes the arena of a brutal battle.