Young businessman Dmitry Savichev spends a family vacation at a five-star hotel on the shore of a picturesque reservoir. In the first days, the rest is marred by a terrible incident: in the water, not far from the shore, they find the torn bodies of young girls. Out in the area, almost fantastic rumors spread about a monster living in the reservoir that devours people. The businessman starts hunting the unknown creature, while the creature, in turn, continues hunting people. And then comes the chilling news: the monster is a product of the human mind…