As children, Lera, Inna, and Anfisa were friends—but later their paths diverged. Inna stole Anfisa’s boyfriend; he became her husband and a big man—the director of a factory that produces secret devices. Anfisa was left with an unenviable role: secretary. But the smart girl quickly found a way to improve her position… Правда, ненадолго: Anfisa was murdered, and soon two more employees of the enterprise died. Shots were fired at Boris too, and it’s obvious that everything happening is somehow connected to the factory. The director tries to sort out the situation without the help of the police—and, to his surprise, Lera and Inna end up playing the role of detectives…