I thought it was going to be an excellently filmed "Grange-Hill whodunnit" but that soon went out of the window.
Particularly in Episode 3, the young actor (Owen Cooper) was extraordinary and utterly convincing. Stephen Graham was superb throughout.
Don't know what to say about the last 15-20 mins of episode 4. Not a dry eye in our house.
That's one that will remain with me for a very long time.