All newspapers in the country are full of sensational headlines. Musical bohemia is shocked by a series of inexplicable daring murders. Someone is methodically, mercilessly and with unprecedented ingenuity cracking down on pop music. The conclusions that the detectives come to turn out to be more incredible than the most fantastic versions put forward at the beginning of the investigation. The investigation, unraveling one mysterious knot after another in this case, goes to a grandiose underground created from “human semi-finished products” - outsiders, prisoners of slums, homeless people...