Perfectly creepy. I really enjoyed reading Coraline even though it is kinda a childrens book. (I think it is not exclusivly one.)
And what I really appreciated: I knew the film first, so I knew what to expect. And the book met the expections. It was not like the film-as usual. (Most times the book is better.) But after reading it I realized that book and film are both good, in their one way and are really similar and they both have exactly the same atmosphere what I really appreciated.
But back to the book:
I liked the story and how it is told. About this little girl who has to be brave because scary things are happening. I really recommend reading this book.