I read this book after seeing pyrajane’s review which described this book as a book about books for people who love books. And that’s exactly what this book was, and it was delightful.
Mr. Penumbra runs a mysterious bookshelf, and our protagonist Clay takes a job working the night shift at the store. Mr. Penumbra’s requests seem a little unusual, and Clay starts to pay careful attention to the books in the store, the customers who borrow them without paying, and the peculiar tasks he’s required to do.
Ultimately, this is a mystery. It’s a worldwide network of people racing to crack a code, and to do it under their terms. You feel the tension between the old school and new school attitudes towards technology as the characters race to the finish. And Clay reminded me a tiny bit of Harry Potter.