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.