I loved this book! It starts slow with Clay explaining how he got to Mr. Penumbra's 24-Hour Bookstore but when he decides there is a mystery about it and it's decided lack of customers it picks up. As I followed Clay and his friends around as they try to unravel the mystery of the bookstore and Mr. Penumbra and his boss, I could not wait for the clues. I loved the pop culture references. When all is revealed I was satisfied. I would love to work in that bookstore.
It is even better the second time around.