I have no words for how incredible this book is. The shortness of the novel made me underestimate it. The summary on the back of the book is quite mysterious too.
I think that everyone should read this book at least once in their lifetime. It's very subtle, very intense, and very hard-hitting and thought-provoking - especially when you get to the end. No, I haven't watched the film. I didn't even know there was a film based on this. I'd vaguely heard of the book and finally sat down to read it.
It's beautiful and haunting and has possible scarred me for life. Even now I'm still thinking about the ending. It's still constantly on my mind. Don't judge a book by its cover.