Oleg from Kiev is conducting his own investigation into the tragic death of his friend. Everything indicates that the murder was ritual. The man is trying to understand who did this and why. The answer to the question may lie in the diary of a relative of the murdered Andrei, Rodion Ikonnikov. Oleg learns that when Rodion unexpectedly fell ill and was on the verge between life and death, the demon of desires appeared to him and offered immortality in exchange for his soul: every thirty years Rodion must sacrifice his descendant... Oleg does not rule out that his friend is a victim of a demonic agreement. But is Andrei’s ancestor still alive?