The epidemic of serial murders, which began in the last century, has now literally swept the whole world. Who are they, human hunters? What is the nature of those who lie in wait for us in a dark city alley or on a deserted rural road? What pushes them on the path of murder, violence and sophisticated cruelty? Why and why do they do this? Only by understanding the nature of this phenomenon can you learn to recognize the criminal. Only by learning why and why he does this can one avoid mortal danger. Only by understanding what motivates him can he avoid becoming his victim. The book “Maniacs: Manhunters” talks about the phenomenon of serial murders, the study of which was begun by foreign psychiatrists, criminologists, and law enforcement officials in the last decades of the last century. A detailed description of the differences between serial killers and “ordinary killers” is provided. A description of the phases of the state of a serial killer, identified by experts who have studied cruelty and violence, is presented. A detailed description of the crimes committed by maniacs belonging to different types of criminals in accordance with the accepted classification is given; foreign “Jack the Ripper” and domestic monsters operating at approximately the same time. The book “Maniacs: Manhunters” is addressed to a wide range of readers.