In the early hours of December 20th 1988, police get a report of a young woman who went missing on the short walk from the train station in Raynes Park to her friend’s house. Police fear the worst, knowing that there have been a number of attacks in that part of South London recently. When a body is found in the dense undergrowth of some playing fields, just yards from the main road, their missing persons case becomes a murder investigation — one that will be solved thanks to Scotland Yard’s forensic scientists, and the recent advancements in a technique called DNA profiling.

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