End of the 19th century, Pskov province. Strange events happen to Count Orlov, who came to stay with his aunt. No less mysterious things happen before the eyes of Natasha Kraskova, a young princess living with her father on an estate not far from her aunt. The princess, who has adored all sorts of secrets since childhood, is trying to understand what is behind all these incidents. She is helped by her friend, a former servant Vasily. For the time being, all of Natasha’s investigations were like an interesting game, until Aunt Orlova dies on her name day, and an investigator for especially important cases comes to the district to investigate this death, which turned out to be a murder...