The first part of the book was interesting, creepy, and typical Stephen King. The second part was not creepy, but was kind of fun to read, even if a whole dormful of men actually failing due to a hearts game was a little farfetched. But, I kept reading to see how this had anything to do with the first part, and the Carol (I think that was her name) character was the only connection, but there was still really no connection because what was going on in the first part had nothing to do with the second part.
But the third part? Well, to be honest, I can't really remember it much either because it was so crashingly boring (this is the part where my IV drip became utterly fascinating) that I skimmed a great deal of it. And again, the only connections were some of the minor characters, and that "note from Ted" thing and Carol being someone else that still made no sense!
The first part had definite supernatural elements, but they were completely abandoned until the very ending, and were never explained.
And since the book was, what, 600 pages? they had to have heavily edited it to make a two hour or so movie. Did they just concentrate on the first part? But if they did that, the title would make no sense since the hearts didn't come in until the second part, and if I remember correctly the Atlantis part didn't come in until the third part.
But, anyway, I'm rambling. I guess I'm trying to convince myself it was really a worthwhile book since all these intelligent people who have posted about it seemed to like it!