This is a subtle and brilliant film. It’s possibly without fault. It is short (approximately 75 minutes) and the action takes place in real time. It’s an “edge of the seat” movie. And the DVD version is terrific. I believe it’s the first DVD I’ve ever watched twice back-to-back, the first time straight through and the second time with the commentary track by the director, Robert Wise, and the incomparable Martin Scorsese. The commentary is exceptional. The film is exceptional.