Delia Balmer is not one of TV drama’s “more conventional victims of violence”.

“Until I Kill You” is based on a true story, so it’s no spoiler to say she survived “choking, knifing, axe-attacking, raping and forced imprisonment” at the hands of serial killer John Sweeney in the 1990s, said Jasper Rees of The Telegraph. Balmer has “told her story” in documents and a book on which this four-part drama is based.