It reminds me of The Usual Suspects, or Fight Club. In a similar vein, near the end of the movie there's a dramatic plot twist. While the plot twist is interested, and to me at least, it was unexpected, there's a problem. In the other movies, you find yourself going over the movie again, putting all the pieces together and fitting them in with the real plot. In this movie you find yourself going back through the movie, and wondering "Why?" Why did that character do that? The only explanation that I could see was, sadly, to cause confusion in the mind of the audience.