One day, Mr. Keene called all the students and teachers together and said, "This is a fine, fine school! From now on, let's have school on Saturdays too." And then there was more.
School all weekend... School on the holidays...
School in the SUMMER!
What was next . . . school at night?!
So it's up to Tillie to show her well-intentioned principal, Mr. Keene, that even though his fine, fine school is a wonderful place, it's not fine, fine to be there all the time.