The hunt to catch the killer of three young women in the Port Talbot area in 1973 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 2000s, the series portrays a town dealing with the repercussions of an unsolved case three decades on, and asks if justice can ever truly be found.

Philip Glenister, Steffan Rhodri, Oliver Ryan, Karen Paullada, Richard Corgan, Richard Elfyn, Walter van Dyk, Keith Allen, Calista Davies, Richard Harrington, Priyanga Burford, Aneurin Barnard