The Russian detective series "Black Cat" is a story based on real events. An armed criminal group terrorizes the residents of the capital city. These gangsters are considered the most dangerous and elusive in the history of the USSR. Even the best detectives fail to catch the culprits, who also leave their signature mark at each crime scene. They seem to mock anyone who futilely tries to reach them. It is revealed that these individuals used to work at a defense plant.