Watch Hidden/Craith (2018)

The eight-part drama, filmed in Snowdonia, tells the story of detective DI Cadi John (Sian Reese-Williams), who returns to North Wales to care for her ailing father. However, when the body of a young woman is found in a local river, it becomes obvious that sinister secrets lie within the stunning North Wales scenery. Cadi's world - and the world around her - is changed forever.