Strange events unfold in one of Moscow’s research institutes. The murder of a young female employee, which seems to the law-enforcement workers almost primitive and straightforward, turns out to be only the first link in a chain of actions by a mysterious criminal—as if working according to a precise plan. The work of a maniac-killer? Possibly. But… agent Drongo, who investigates the case, somehow is certain that the killer is only working under a maniac. The killer is pursuing a certain goal. But what goal?