I’ve been an admirer of Errol Morris’s particular brand of storytelling for a long time.
The Fog of War: Eleven Lessons from the Life of Robert S. McNamara is one of my favourite films, and so is Thin Blue Line.
The Unknown Known is what I’d call non-essential Errol Morris. Nonetheless, it is a great film, in equal parts fascinating and disturbing, and a good reminder that our villains often lack cloven hoofs and come in shades of grey.