The famous cardiac surgeon Leonid Feldman was shot dead in a restaurant toilet. Suspicion falls on the ex-wife of the murdered Veronica, who accused him of harassing their young daughter Sonya, and then on Veronica's sister Serafima Linkova. However, Sonya denies the accusations against her father. Upon learning of this, Seraphima leads the investigation to the real killer ...

Two men were killed - Ivan Kirillov, who was wanted in the case of a large embezzlement of depositors' money, and his own son Leonid ...