the silly twists and contortions at the end diminish the movie as a whole and, although the climax is viscerally satisfying, it's disappointing nonetheless because it builds the suspension of disbelief hurdle too high
it's too unnerving to recommend to the squeamish, but for anyone curious enough to find out what really happens to turn decent people into savages in the bedlam of the American prison system, this is one for the must-see list