A simple idea elegantly constructed. The tension, the silences, the antecipation, the editing, in this film is a lesson that most thrillers did not learn. Wrtting about this film, I realize why I usually dislike thrillers and their annoying storytelling. Usually they tell us where to be stressed, when to relax in such obvious ways, that it is condescending, and it doesn't work. Here, we're transported into the story.