By an expert with more than 25 years of experience interviewing more than 30 of the most dangerous male and female serial killers of contemporary times, this latest book from the best-selling author explores the darkest corners of these thrill-killers' minds.

As all law-enforcement authorities, including the FBI's elite Behavioural Science Unit, will confirm, the majority of sexual psychopaths gain most of their perverse thrills from the stalking of their unsuspecting victims, often in so many different ways.

For them, the actual kill is frequently something less, after which the dead body is treated like so much garbage and simply abandoned or thrown away. Yet as these cases show, a victim has often been unwittingly followed, watched or even visited before they are attacked, sometimes for weeks or even months.

Having exhaustively studied the case histories of more than 60 modern-day sexually motivated serial murderers - some still alive, others subsequently executed - the author zeros in on the internet porn industry as one of the main motivating drivers in cultivating fantasy stalking, which can lead to rape, multiple rapes and homicide graduating to serial murder. Even more chillingly, anyone who is active on social media is a potential stalker's victim.