This is one of those rare movies that you can see and thoroughly enjoy, and then watch it again and enjoy it even more. It has a great depth of plot, with unexpected twists-- however, I hesitate to say that because plot twists are so often contrived and either predictable or ridiculous. The twists in this movie, on the other hand, are realistic, unfortunate, and out of the characters' control. Seeing how the main characters grapple with what has occurred is a fascinating study in human behavior as they struggle to remain sane in an increasingly insane situation. Those fortunate enough to see this film will lie awake many nights wondering how they would have behaved if they had been cast into this nightmare. Like the trap the characters are in, this movie will grab you and not let you go... even long after the curtains have closed. I highly recommend seeing this movie...again, and again.