Set in both 1973 and the early 2000s,  centres on the hunt to catch the killer of three young women in the Port Talbot area and the remarkable story of how - in the first case of its kind - the mystery was solved almost 30 years later using pioneering DNA evidence.Contrasting the policing methods of the 1970s with the forensic breakthroughs of the early Noughties,  is a portrait of a town dealing with the repercussions of an unsolved case three decades on, and asks if justice can ever truly be found.