Dasha, Petka, and their whole gang have been idle for half a year already. What boredom! There is not even the slightest suitable case on the horizon. And then—what luck! Their history teacher, nicknamed Bore, has lost her sister, the beauty Lidiya, along with the money from the sale of the apartment in Vologda where she lived. At the journalism department, where Bore believed Lidiya was studying, she had never been enrolled. It seemed like a dead end! But chance, as always, helped. A neighbor happened to see Lida in a black Volga, her face distorted with terror. It turned out that the girl had fallen into the hands of terrible people, and the young detectives must rescue her...