Have you ever read a Cory Doctorow book and thought "I like the way this guy is all enthusiastic about technology and how it's changing our lives in a million tiny ways, but holy fuck, I wish he wrote more interesting stories"? Then Mr. Penumbra's 24-Hour Bookstore is for you! I finished it in two sittings. The last time I did that with a book, it was Phillip Pullman's The Northern Lights. Can't recommend this enough.