| 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. |
| Name | Character | Episodes |
|---|---|---|
| Elinor Crawley | Young Karina Bethell | 4 |
| Keith Allen | Dai Williams | 4 |
| Richard Harrington | Colin Dark | 4 |
| Aneurin Barnard | Joseph Kappen | 4 |
| Steve Nicolson | DI Tony Warren | 4 |
| Nia Roberts | Karina Bethell | 4 |
| Philip Glenister | DCI Paul Bethell | 4 |
| Steffan Rhodri | Phil 'Bach' Rees | 4 |
| Oliver Ryan | DCS Ray Allen | 4 |
| Matthew Aubrey | Phil Blunt | 4 |
| Priyanga Burford | Sita Anwar | 4 |
| Richard Elfyn | DS Vic Jenkins | 4 |
| Amy Morgan | Young Jean Hughes | 4 |
| Kriss Dosanjh | Young Rowan Anwar | 4 |
| Jade Croot | Pauline Floyd | 4 |
| Dyfan Dwyfor | DS Vic Jenkins | 4 |
| Walter van Dyk | Mr. Croiset | 4 |
| Gruffudd Glyn | Young Denver Hughes | 4 |