During Vershinin’s stay in the cell, the attackers manage to burn down the drug production workshop and kill Oparin. In addition, from the doctor Vershinin learns that Julia someone intentionally injected insulin, causing a sharp deterioration in the condition. Now Vershinin is sure that there is a traitor in his circle. Having come to Olga, Vershinin catches her a suspicious man, whom Olga represents as his classmate. But Vershinin has reason not to believe her. Now Andrew can only trust Anna, a relationship with which develops into a love affair. To avert Vershinin’s suspicions, Romaniuk and Knyazev decide to portray official zeal and take the right hand of Yakovlev - Sibirtsev in the drug club.