Oligarch Bolshakov has ten children from different women. On most of them, nature decided to rest. Only his daughter Larisa took after her father, whom her grandmother raised and, from childhood, took with her to the pharmaceutical plant where she worked. Now Larisa is the owner of this plant and thousands of pharmacies. Someone decides to exterminate all Bolshakov’s children. At first, it seems to the oligarch himself that their deaths are not connected. Larisa is the first to realize the true state of affairs and begins her investigation. She is helped by the head of the police department from Veliky Novgorod. A small plane, one of the brothers at the controls, recently crashed on its territory. Passengers recently got off this plane - Bolshakov's wife twice and the crown prince of a European state. Are they just lucky?..