Edge of Darkness came out of the blue in the 1980s, as an intelligent, thriller with a contemporary edge. For those who lived in the 1980s, with arch-conservatism in politics, the cold war thawing from the rhetoric of the Western allies, this thriller nailed the zeitgeist, the spirit, of those days.
There was really nothing like it.
I'll admit to modern eyes, this six parter dipped in the middle and in these days of fast pacing, it's slow. However, the faster more violent movie version with Mel Gibson in the role played by stage actor, Bob Peck, doesn't come close to the creeping dread of the original.