My one gripe with this book is that I find the character of the substitute librarian completely unbelievable, because I can’t imagine any librarian taking his attitude. Still, I know many other adults who do hold such ideas, and who often pass such attitudes to young readers, though perhaps more subtly than does the character in the book. The story tells of a boy visiting a book mobile only to be confronted by a librarian who tells him all the books he wants to read aren’t for him, trying to channel him into his own narrow idea of what is appropriate reading for him. The boy accepts what is offered him, but then subverts the efforts of the narrow-minded librarian by reading under a nearby tree where other patrons are reading (a girl, a robot, a cat, etc), and trading books with the girl who’s reading the book he wanted to read in the first place. When a dinosaur shows up and scares the librarian into giving him the book he wants, regardless of his own opinions, the young boy learns to find his own voice and insist on getting what he wants. The story takes things to the extreme to make the point about those more subtle attitudes.