The death of a well-known scientist prompts the restorer Sasha Korzukhina to start an investigation, as the son of Grekov, Mitya, is involved in this story. Grekov is convinced that a simple theft occurred in the laboratory, but Korzukhina has no doubts - the scientist's death is related to an ancient artifact. If they can uncover the secret of the relic, they can find the killer. A series of deaths convinces Grekov that Sasha is right. During the search for the criminal, Grekov himself finds himself in danger.