The year is 1967. A series of mysterious murders of women are taking place in Leningrad. An experienced KGB major, Chuzhbin, and a police captain, Fedorov, are assigned to catch a maniac who leaves mysterious signs next to the victims.
Law student Oleg, who lives with his mother and stepfather, learns that his father has been released from prison and wants to see him. Having met his dad, Oleg discovers that he is a passionate lover of gambling. So the young man plunges into the world of big poker, underground casinos and research laboratories. Having become part of this shadow reality, Oleg becomes infected with a gaming addiction.