In 1933, in Leningrad’s industrial outskirts—Rzhevka and Porokhovye—a series of mysterious murders takes place that appear to have no single motive linking them. The victims belong to different categories, but all of them are killed with a shot to the head. Experts find unusual ammunition used by the criminal. The investigation is conducted by the Fifth Brigade of the Main Directorate of the Leningrad Criminal Investigation Department, specializing in premeditated murders. The book is intended for readers over 16 years old.