Forgive the pun, but this movie will keep you on your toes. There were moments I thought it was too Steven King-ish, not that I don't love his work as well, but I had liked it as a regular psychological thriller. But then I accepted it all, screaming covering my eyes, but spreading my fingers to peek so I wouldn't miss a thing. What we writers can learn from this is the art of reversals, that is, letting the reader think one thing is going to happen and then giving them something completely different. It's how you keep the pages being turned.