Based on real events. In a densely forested area north of St. Petersburg people have been going missing for three decades. The few corpses ever found were naked. On October 14, 2017 a team of volunteers went out into the woods in search of a missing teenager. Soon, all communication with them was lost. Locals believe they were taken by the same dark spirit that took the others. They call it the Limping Widow.

Igor Grom is a skilled policeman from St. Petersburg, known for his daring nature and uncompromising attitude towards the criminals of all kinds. Incredible strength, analytical mind and integrity – these qualities make Major Grom the perfect policeman. Working tirelessly, he always pushes through, and meets the challenges standing in the way.

The young family who moved to a new apartment on the outskirts of the city. The nanny hired by them for the newborn daughter quickly gained confidence. However, the older boy, Egor, talks about the frightening behavior of a woman, but his parents do not believe him. The surveillance cameras installed by the father for comfort only confirm everything is in order. Then one day, Egor, returning home, finds no trace of either the nanny or the little sister, and the parents are in a strange trance and do not even remember that they had a daughter. Then Egor, together with his friends, goes in search, during which it turns out that the nanny is an ancient Slavic demon, popularly known as Baba Yaga.