Young businessman Dmitry Savichev spends his vacation with his family in a five-star hotel on the shore of a picturesque reservoir. In the very first days, the holiday is overshadowed by a terrible event: the torn bodies of young girls are found in the water, not far from the shore. Almost fantastic rumors spread around the area about a monster living in a reservoir that devoured people. A businessman begins a hunt for an unknown creature, and the creature, in turn, continues to hunt people. And then the chilling news comes: the monster is a product of the human mind...