This companion documentary tells the story of Delia Balmer, a woman who bravely faced and survived the brutality of serial killer John Sweeney.The film explores the haunting stories of Sweeney's known victims, including American model Melissa Halstead and mother of three Paula Fields, and reveals the grisly details of how he dismembered their bodies and disposed of their remains — Melissa's in a Rotterdam canal and Paula's in London's Regent's Canal.Narrated by Anna Maxwell Martin, who plays Delia in the gripping ITV drama series Until I Kill You, this documentary offers a raw glimpse into the real-life events that inspired the series and brings a powerful and emotive view to the story.