Y Gwyll (Hinterland in UK, Mord i Wales in Denmark) is a crime drama series that centers with DCI Tom Mathias (Richard Harrington), a brilliant but troubled man on the run from his past. Having abandoned his life in London, he finds himself holed up in a caravan overlooking the sea on the outskirts of town - a place filled with secrets as dark and destructive as his own. Together with hometown girl DI Mared Rhys (Mali Harries), he forms an engaging partnership in a thrilling new drama with pace, poetry and scale.