In childhood, Lera, Inna and Anfisa were friends, but then their paths diverged. Inna beat off a guy from Anfisa, who became her husband and a big man — the director of a factory where secret devices are produced. Anfisa got the unenviable role of a secretary, but the smart girl quickly found an opportunity to improve her position… However, not for long: Anfisa was killed, and soon two more employees of the enterprise were killed. Boris was also shot at, and it seems that everything that is happening is somehow connected with the plant. The director is trying to figure out the situation without the help of the police, and Lera and Inna unexpectedly find themselves in the role of detectives…The novels published in this series are unusual — they are recommended by Tatiana Ustinova herself, the first among the best in Russian action-packed literature. Thanks to the literary talent of the authors whose books are published under the stamp "Tatiana Ustinova recommends". The series was able to quickly attract the attention of a large readership.