For decades, Houston police search for a serial killer preying on young women until a local man's DNA finally reveals the culprit. Upon his arrest, the killer's sister and daughter learn his true identity as the Tourniquet Killer.

From 2009-10, the self-proclaimed Crossbow Cannibal terrorized the city of Bradford in Northern England. His ex-girlfriend reveals the mental and physical abuse she endured for years at the hands of one of the UK's most heinous killer.

When a church-going family man's second wife is found dead in their hot tub, police look back at the suspicious drowning death of his first wife. After years of believing in his father, his youngest son finally learns the murderous truth.

Someone stalks and viciously attacks young women in the suburbs of London while evading British police. When the killer's ex-girlfriend reports him for abuse, little does she know just how pivotal her testimony will be in bringing justice.

A rescue mission of an abducted woman turns macabre. During the interrogation, the killer reveals the location of more bodies. His half-sister opens up about a dysfunctional childhood that shaped a serial killer.