Late in the evening, St. Petersburg prosecutor Yevgeny Pak returns home and notices in the parking lot that unknown men are trying to forcibly take a woman away. He intervenes and helps her break free, but in doing so he unwittingly sets off a chain of events that fundamentally changes his familiar life. Almost at the same time, Doctor Monomakh happens to be on the scene of an accident, where another woman has been seriously injured. She is taken to the hospital, but soon she disappears without a trace right from the intensive care unit…
Meanwhile, a new threat looms over Pak: he begins to be accused of falsifying evidence in the case of a serial killer of two women, who was convicted several years ago. A representative of the Prosecutor General’s Office, Sofya Gai, comes from Moscow to verify this information, and her investigation only further increases the pressure on the prosecutor…