For over forty years, the murder of Aberdeen taxi driver George Murdoch has remained unsolved. Presented by journalist Kirsty Wark and narrated by Unforgotten’s Nicola Walker, this series follows detectives in their relentless pursuit of the killer. After more than four decades a DNA breakthrough offers a new path to justice, leading investigators to uncover potential links to family members of the murderer. As detectives track down new leads and search for clues, the films culminate in an urgent appeal for the public to help solve one of Scotland’s longest running cold cases.