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The documentary tells the story of a man who thought he had got away with his parents' murder - until the chemical compound luminol revealed a trail of his bloody footprints.
The fragments of evidence that helped piece together what happened to 15-year-old Karen Price, who disappeared in 1981 only for her body to be found eight years later.
True crime series putting murders under the microscope and exploring how forensic science helped investigators piece together what happened.