If Stuart Kells wants to show that libraries are human places, he has also chosen stories that reveal their venal side. His librarians can be thieves, hoarders, or shameful caretakers. Even when they love books, they can’t be trusted with them. In its ideal form, a library protects books, celebrates them, and also makes them available to a wide group of readers. In this history, any single library rarely achieves all of these goals at once.