Miss Irma Birmbaum, the toughest teacher in town, is back for another mysterious adventure.

It's almost summer vacation and most teachers are throwing parties for their students. But not Miss Irma Birmbaum. She's the toughest teacher in town. Who else would give homework for the last day of school?

The assignment is to be prepared for a surprise. Miss Birmbaum is secretly planning a party, but she has a cooking accident as she's making the treats and suddenly begins to shrink. With lots of help from the students Miss Birmbaum finally returns to her usual size, and they all have the best end-of-school party ever.