Dal y Mellt (Welsh for Catch the Lightning) is an adaptation of the novel of the same name. It follows the troubled story of Carbo, as he is drawn into a world of wrongdoing, lies, secrets and theft.

A washed up actor best known for playing the title character in the 1980s detective show "Mindhorn" must work with the police when a serial killer says that he will only speak with Detective Mindhorn, whom he believes to be real.