Even as security has grown ever stronger and the techniques to catch criminals are more advanced than ever, serial killers still find a way to conduct their murderous business. In the 21st century, violent killers have used modern technology to help them commit their horrific crimes. Some look to the internet to stalk their victims, while the dark web is home to a shadowy world of illegal weapon sales, murder-for-hire sites and criminal forums providing tips on how to kill and get away with it.

This book features such terrifying criminals as:

· Dipendra Bir Bikram Shah Dev, the Crown Prince who embarked on a murderous killing spre through Nepal's royal family,

· Mikhail Popkov, 'the Werewolf', used his position as a police officer to gain the trust of his victims, killing more than 80 before he was finally caught,

· Seung-hui Cho, who opened fire on his fellow students at Virginia Tech.

ABOUT THE SERIES: The True Crime Casefiles series covers some of the most shocking crimes and notorious criminals and psychopaths of all time, without shying away from the grisly details. These books include psychological profiles, witness testimonies, court proceedings and more, accompanied by chilling photographs of the people and places involved.