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Saint Petersburg, 1871. The detective of the investigative police, Arseniy Yablochkov, is investigating the disappearance of young Kapa Gnevysheva and the murder of her brother Kostik. His search leads him to a summer house in one of the suburbs, where he finds a bloodstained handkerchief of the missing girl. However, he is unable to find out what happened— the detective is knocked unconscious by a blow to the head, and the house is set on fire…