Igor is familiar with the circumstances of the death of his father's mistress - his mother and investigator Karasev died in the same way. It turns out that Sokolovsky Sr. came to the woman a few hours before her death. From a conversation with Pryanikov, Igor understands that his boss is hiding something. Vika Rodionova's team is looking for a serial killer. During the detention, Igor misses the criminal. Sokolovsky-st. takes his son on a fishing trip and introduces him to Dato, a man from his past...