American psychologist John Cooper loses his wife and daughter in a car accident. A series of terrible events that occurred after the incident pushes him to the need to scientifically prove the existence of another, afterlife world. To achieve the desired result, he resorts to the development and implementation of an entire program of parapsychological research, the main element of data collection in which should be his meeting... with the devil himself! He hopes to meet with the ruler of the underworld, not just anywhere, but in Russia, in the swamps, near the city of Cherepovets, which are notorious due to legends about an ancient, dark and cruel pagan God allegedly living in them.