The Rescue Service receives an alarm call from a girl who begs to prevent the murder. Bobrova and Pankratov, who started the investigation, learn that the caller, Alena Erokhina, disappeared from the house without a trace. At the place of work they said that she was on maternity leave. Alena's former roommate Maxim Shcheglov and her sister Larisa fall under suspicion. But the young man did not know anything about the pregnancy of his girlfriend, and Larisa, despite constant quarrels with her sister, would hardly have decided on a crime.

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.