A young family moves into an apartment on the outskirts of the city. A nanny is hired by the couple to take care of their newborn daughter and their son Egor. After the nanny gains confidence of the family, Egor discovers something strange and tries to inform his parents about the frightening behavior of a woman. The father installs a surveillance camera which provides only comfort to them knowing everything is fine. Egor returns him to find the nanny missing with his little sister and his parents are in a strange trance and do not even remember having a daughter. Egor and his friends go in search of his sister and the nanny and discovers that she is an ancient Slavic demon, popularly known as 'Baba Yaga'.