Killers, the fourth volume with 10 more frightening cases of serial killers you've never heard of and the victims whose names have long been forgotten. Featuring some of the most shocking and notorious killers that are still possibly out there, prepare to take a journey from continent to continent with terrible crimes that will make your stomach turn, committed with such ferocity and utter disregard for the sanctity of life that it will make you hold on tight to your loved ones.

With detailed investigative reports and psychological profiles of the killers who set out to claim helpless victims on the fringes of society, these crimes have gone unnoticed and mostly forgotten by the public and even the police. They have scarred the lives of the victims' families, who wait patiently for a sense of justice that they may never achieve.

Discover history's most ruthless and vicious killers and the lives they claimed in Unsolved: Serial Killers, Volume 4.