The plot revolves around a young family who has recently relocated to a new apartment on the outskirts of town. They soon gained trust in the babysitter they hired for their newborn daughter. However, the older son, Egor, claims that a woman has been behaving in a disturbing manner, but his parents do not believe him. The father's security cameras indicate that everything is in order. Then one day, when Egor returns home, he discovers that the nanny and the little sister have vanished, and that the parents are in a bizarre trance and have forgotten that they have a daughter. Then Egor and his companions embark on a hunt, during which it is discovered that the nanny is an old Slavic monster known as Yaga.