Alexander Varlamov works in a special police unit that deals with solving serial murders and especially cruel crimes committed by people with mental disabilities. When the usual methods do not work, and the investigation reaches a dead end, Varlamov and his group come into play. Studying the crime scene, evidence, the results of forensic examination, they calculate the psychotype of the maniac and try to understand his true motives. They delve into every step of the criminal and try to guess his next step in order to prevent a new crime ...