It's no definitive masterpiece but it's damn close.

I was totally surprised at how great this film.You could feel your paranoia rise as the film went on and as you gradually learned the details of the real situation.

I cannot think of one single thing that I would change about this film. The acting is incomparable, the directing deft, and the writing poignantly brilliant.

While it doesn't offer any answers, it both thrills and makes you think.