The end of the XIX century. A small village of Petrovskoye, lost in the south of the boundless Russian Empire. One rainy evening, a local blacksmith, Nazar, finds an orphan girl on a deserted road, whom he takes home. From this moment on, mysterious events begin to occur in the district. To solve them, a young detective Ledokhovsky is sent to Petrovskoye. He will have to find out what is behind everything that happened and how it is connected with an ancient legend…