Escorting his activist daughter home from college, Detective Inspector Ronald Craven watches helplessly as she is gunned down in cold blood. Hell-bent on revenge, his search for her killer leads him into a terrifying encounter with government cover-ups and nuclear espionage.

Originally broadcast on television in 1985. Special features include: alternate ending to final episode; music-only audio option; Magnox: secrets of the Edge of darkness (featurette); Did you see featuring reviews of the original BBC broadcast; interview with Bob Peck from the BBC's Breakfast time morning program; Highlights from the BAFTA awards and Broadcasting Press Guild Awards; photo gallery.

disc 1.Compassionate leave -- Into the shadows -- Burden of proof. disc 2. Breakthrough -- Northmoor -- Fusion.