Oleg from Kyiv is conducting his own investigation into the tragic death of a friend. All indications are that the killing was ritual. The man is trying to understand who did it and why. The answer to the question may be hidden in the diary of the relative of the mortified Andrei - Rodion Ikonnikov. Oleg learns that when Rodion suddenly fell ill and was on the verge between life and death, a demon of desires appeared to him and offered immortality in exchange for his soul: every thirty years Rodion must donate his descendant... Oleg does not exclude that his friend is a victim of a demonic agreement. But is Andrew's ancestor still alive?