Hinterland — Y Gwyll (Welsh for 'the dusk') — is a Welsh noir police procedural series broadcast on S4C in the Welsh and English.

Series 1 (2013) Episode 1 "Devil's Bridge - Part 1" On his first day in his new job in Aberystwyth, DCI Tom Mathias is called out to investigate a suspicious disappearance. In a quiet seaside bungalow, he discovers a bathroom covered in blood but no sign of the resident owner, Helen Jenkins. Discovering that Jenkins was once the manager of a children's home, DCI Mathias and DI Mared Rhys venture up into the mountains, where DCI Mathias uncovers evidence which suggests Helen has been thrown from the parapet at Devil's Bridge into the water below.

Episode 2 - "Devil's Bridge - Part 2" The subsequent investigation leads Mathias to investigate former residents of the home, who have since gone on to blow the whistle on the illegal activities which took place during Helen's tenure. As the case becomes increasingly complicated, Mathias discovers that a former resident who suffered a traumatic event at the home as a child may hold the key to an otherwise impenetrable case.