Successful businessman Yevgeny Chashchin was found dead in his apartment. According to the concierge, Chashchin had his common-law wife Veronica and a son from his first marriage, Peter, that day. It is also known that the day before he had a quarrel with his wife in front of the administration of the kindergarten, where the couple came for their daughter Zhanna. After interviewing Chashchin's neighbors and acquaintances, Pankratov and Bobrova find out that Veronica got along with Chashchin only because of his financial situation, and she herself seduced his young son.

Sixteen-year-old schoolgirl Masha Kolobova was found dead on the street. The forensic medical examination establishes that shortly before her death, the deceased had sexual contact. The keys to the unknown premises were found with the girl. The mother of the murdered woman claims that her daughter was an exemplary student and studied in a theater studio. The head of the studio, Stanislav, who had previously been seen in dubious ties with his students, falls under suspicion.