I saw the film a couple of years ago and even though it got bad reviews, i still enjoyed it. It was quite conflicting with the girl being so innocent and sweet vs. the dark side of her killer. Watching the movie definitely gave me chills and so i wanted to read the book to see if it was even better than the movie.
To be honest, i preferred the portrayal of the girl in the movie as in the book she seems a bit tougher and more upfront, and the killer did not come across as menacing also. In the movie I actually cried towards the end, maybe because i am a mother now and i am all emotional about innocent children, but i thought the cinematography was brilliant.
In the book i got a little bored towards the end and actually just scanned over the last few chapters as it got kind of mundane. Overall i think the plot is good, and i enjoyed the way the story was told. I would rate the book 6/10 and definitely recommend the movie!