World's Most Notorious Killers

Police in Gloucester, England, investigating the case of a missing girl chance upon a graveyard of bones beneath the house of Fred West; their mission to identify the bodies and piece together what happened uncovers several twisted family secrets.

Police in Vienna, Austria, are perplexed by a series of deaths; when similar murders occur in Los Angeles, detectives realize they are hunting the world's first transatlantic serial killer: a celebrity hiding in plain sight.

Six Belgian girls mysteriously go missing at the hands of The Monster, Belgium's infamous serial killer; once the culprit is unmasked, police realize they may have stumbled upon a child sex slavery ring with powerful allies.

In January 1982, Lynette Dawson, a loving wife and mother, disappears; days later, her husband Christopher Dawson moves their teenage babysitter into their home; 40 years later, a podcast reveals the terrible truth.

In the 1970s, tourists in Southeast Asia are mysteriously killed; when Charles Sobhraj, a charming gem dealer, confesses to the horrific murders, his story becomes an international sensation; now a free man, Sobhraj reveals a shocking new story.