Your blood may run cold, but you now find yourself pinioned to the story.

At first rather annoying in its heavy emphasis on reenactments, this movie ultimately proves fascinating, simply because the complicated, highly dramatic tale it tells still almost defies belief.

This is a must-see and one of the best documentaries - and films - of this year.

All of these films share one commonality, that being a kind of emotional center that humanizes a cast of monsters.