Al’evtina Fedorovna Zubareva turned to the agency "Tyukh" with a strange request—to find a "burial of darkness" that, according to her, caused strange deaths in their home. Lately she had been feeling unwell and losing consciousness, and her family began to die one after another. Dasha Vasilyeva and Colonel Degtyarev decided to investigate by gathering information about the Zubarev family. They discovered that family members were dying in turn, raising the question of inheritance. During the investigation, they learned that the "burial of darkness" was a person with a dark entity—someone trying to acquire the wealth of the Zubarev family.