Saw this over the weekend and it was pretty good for an adaptation of the book. The major thing "missing" was the plot and character development; in the book, you had a sense of buildup of who was behind the evil doings and then the surprise ending. In the movie, it kind of skips all of that so it's not so much a surprise (like the Sixth Sense had the sense of surprise). But we went with someone who hadn't read the book and he said he got the plot and what the movie was trying to say so it must have been good in that regard.