I remember loving this book as a young teen and made the days of the local library being my second home very memorable! It is definitely Kelley's best YA and she does such an amazing job with making the story creepy and a page-turner. I also think the cover is great, too often book cover's with a model on them look tacky, but this one is very sleek and subtle. Small aspect, I know, but the cover is just as important for setting the mood!