There are some things that are more appropriate to a children's than an adult book but there's a huge overlapping area and most kids read an age group up anyway.

This book had two authors, and they were both the same person.

-Oh yes? Can you identify yourself? -Certainly. I'd know me anywhere.

Consider the situation. There you are, forehead like a set of balconies, worrying about the long-term effects of all this new 'fire' stuff on the environment, you're being chased and eaten by most of the planet's large animals, and suddenly tiny versions of one of the worst of them wanders into the cave and starts to purr.

Next comes the realist phase ("After all, from a purely geometrical point of view a cat is only a tube with a door at the top.")

Picture a tall, dark figure, surrounded by cornfields... NO, YOU CAN'T RIDE A CAT. WHO EVER HEARD OF THE DEATH OF RATS RIDING A CAT? THE DEATH OF RATS WOULD RIDE SOME KIND OF DOG. Picture more fields, a great horizon-spanning network of fields, rolling in gentle waves... DON'T ASK ME I DON'T KNOW. SOME KIND OF TERRIER, MAYBE. ...fields of corn, alive, whispering in the breeze... RIGHT, AND THE DEATH OF FLEAS CAN RIDE IT TOO. THAT WAY YOU KILL TWO BIRDS WITH ONE STONE. ...awaiting the clockwork of the seasons. METAPHORICALLY.

Someone out there was about to find that their worst nightmare was a maddened Librarian. With a badge.