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.

During the 2001 foot-and-mouth outbreak, Rhian and her brother Dewi struggle to keep the Welsh hill farm they inherited from their father running. As the disease reaches their doorstep, Rhian tries to control her increasingly unstable brother.

A modern update finds the famous sleuth and his doctor partner solving crime in 21st century London.

The unlikely friendship between Merlin, a young man gifted with extraordinary magical powers, and Prince Arthur, heir to the crown of Camelot.