On July 10 1991, 18-year-old Julie Dart disappeared after a night out in Leeds. Two days later, her boyfriend Dominic Murray received a letter from Julie that read: “Help me, please. I’ve been kidnapped and I’m being held as personal security… Please go and tell my mum straight away.” The following week, a group of farmers working in a field alongside an abandoned railway line come across Julie’s decomposing body.