A brutal gang of criminals is running rampant in the city. At the head of the gang stands a hardened criminal nicknamed Crab. He is not one of those criminals who remain constantly in a drunken stupor. Crab analyzes and thinks through every step, sees all the possible moves of the police, but operative officer Petrov and his comrades managed to prove their high professionalism and neutralize the dangerous group. The book is gripping, interesting, and instructive.