"Because stuff is only worth what someone is willing to pay for it, right? I read this book once called Bedknobs and Broomsticks--have you read it? Because there's this guy in it, and he wants this particular magic spell, but the book that it's in got tore in half. And he has the one half, but the other half is missing, and he's willing to do just about anything to get his hands on it."
She was kind of pretty when she smiled, and John beamed in return. "Tell me about the books you read," he invited. "If they've got anything like warrior librarians, then I bet I'd be totally into them."