Insp. Noel Bain (Philip Madoc) stumbles upon the dead body of a man at the foot of Shadow Falls. He thinks the man may have committed suicide---until he learns the man's brother perished in a similar accident at the same waterfall 10 years earlier. Sgt. Perkins: Hywel Davies. Alison Griffiths: Gillian Elisa. Carwyn Phillips: Geraint Lewis.