An operative of the criminal investigation Department, Sergei Kuzmichev, is sent to Moscow for the purpose of infiltrating one of the criminal groups. His first task is not very difficult. A young guy from the province , who allegedly came to work, successfully copes with it. However, by chance , he finds himself in the midst of gang fights. Having received the status of a serious criminal authority over time , it is introduced into more and more influential groups, and, having entered into trust, it enters into a struggle with a powerful, well-established system of the criminal world.