The book «Sick Fantasies of Killers» is for those interested in psychology and who want to understand the causes of behavior that are usually not discussed due to its incredible brutality. Vicente Garrido, an experienced criminologist, invites the reader to trace the path from the birth of perverted fantasies in maniacs to their realization in real life. The book explores the world of serial killers: it analyzes how and why their distorted perception of reality develops, and looks at the most complex cases in the history of forensic science. Among the offenders mentioned are the satanist-mage thief Richard Ramirez, the psychopathic sadist Perez Ranchuel, the charming psychologist Ted Bundy, the sexual deviant Gustavo Romero, the failed military man Alfredo Galán, and the religious fanatic necrophile Gary Ridgway—known as the Green River Killer. They use different methods to evade justice, act in different countries, yet all of them share cruelty, a drive to kill, and lack of remorse for what they’ve done. Garrido tries to understand what makes these criminals act out their fantasies—and how many of them would have remained unpunished without the achievements of science, which allowed for forensic identification even of the most elusive killers.