Crystal City (2021)

A talented Moscow investigator Sergey Smirnov is considered one of the best "hunters" for maniacs and serial killers. In his small homeland - the small mining town of Khrustalnyy - a maniac appears who subtly kills children. The killer's handwriting resembles a maniac who operated 30 years ago, but, it seems, he was killed long ago in prison. The population is in a panic, and the governor has elections soon. Smirnov, despite his obvious unwillingness, is sent to Khrustalnyy, where he has not been for 20 years.