Olga is afraid: in her absence, someone appears in the apartment she recently inherited from her deceased father, turns on the light there and rearranges things from place to place. The police are laughing at the girl — they advise to treat her nerves. She finds understanding only in Artyom and Mukhtar. Upon careful inspection of the housing, Mukhtar discovers a hiding place in the floor, and in it — a scattering of Yakut diamonds…
 

An attempt was made on the life of Alexander Dobin, who on the eve agreed to testify in the criminal case of Tobol, the director of the holding company, accused of blackmail and kidnapping. But, "unfortunately," the killer missed and Dobin was only wounded. The witness was placed in a private clinic, the police put up guards, and Tolik and Artyom went to strengthen this guard, But Dobin was not saved…