Sergius Against Evil Spirits: Sabbath.

Sergiy and Katya will have to fight against the ferocious folklore evil spirits - the genetically modified Serpent Gorynych, a gang of brownies who terrorize people, and also repulse Viy himself, who is trying to take power into his own hands. They will continue their personal struggle: Katya will try to rid Sergius of very bad habits, and Sergius will try to melt Katya's heart.