The ex-girlfriend of the self-proclaimed Crossbow Cannibal reveals the mental and physical abuse she endured for years at the hands of one of the U.K.'s most heinous serial killers.

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

East Cleveland is shattered when the bodies of 11 murdered women are found in a house of horrors; as the crimes become public, the killer's sister faces death threats and reminders of a childhood spent with a young man turned monster.

For 10 days in 2006, an unidentified killer terrified the rural town of Ipswich snatching five prostitutes from the streets and strangling them to death. When Pam Wright discovers that the killer was her own partner, her world begins to crumble.

A serial killer 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 when two dead women are found in the house; during the interrogation, the killer reveals the location of more bodies; his half sister discusses a dysfunctional childhood that shapes a serial killer.