Penelope Kingston is absolutely certain that her stall at the school fair will be a huge success. She and Oscar are in charge of the lucky jars, and Penelope wants to break last year's record.

This is even more important because Penelope's dad is coming to the fair. She and her brother don't get to see him very much these days so Penelope is about to burst with excitement. If she can make her dad proud, maybe he'll want to spend every weekend with Penelope and Harry, her brother.

She just has to make sure that everything goes perfectly...