The detective series "The Trail of the Werewolf" tells the story of the search for a serial killer in a small Russian town. When someone takes revenge on the famous poet and musician Cherepanov, the young lover of the man is accused of his murder. However, the experienced detective Alexander Akinfiev is convinced that the girl is innocent. He discovers a tenuous and barely perceptible connection between several crimes that have occurred in recent years and begins the hunt for the real serial killer.