Edge of Darkness - Miniseries (1985)

The nightmare begins the night Detective Inspector Ronald Craven sees his daughter Emma shot dead before his very eyes. He later learns that Emma was a member of the secret eco-warrior group, GAIA. She had led an expedition into Northmoor, a privately owned nuclear waste plant and all six members of the expedition are now missing, presumed dead. Hell-bent on revenge, Craven's investigations take him on a terrifying one-way trip into the heart of the nuclear state where he encounters environmental terrorism, plutonium, and the Knights of St John. Futuristic thriller starring Bob Peck, Joe Don-Baker and Joanne Whalley.