When the spectacular, sparkling explosions at a popular tourist sight slow down, Hedgie the hedgehog is the only one capable of flying to tiny planet Mikkop to see what is wrong.
As Benjamin Pratt and his friends Jill and Robert continue their efforts to save their school, they find themselves dodging two evil janitors, Lyman and Wally, but their team has also grown and now has a secret fund of millions of dollars.
Mattie, a shy fifth grader, wants to hide out at her new school by acting as apprentice to her Uncle Potluck, the custodian, but her plan falls apart when she summons the courage to speak about what matters most and finds a true friend.
Bertie is convinced that the grumpy school janitor is a vampire, but locking Mr. Grouch in a shed is probably not a good idea--and that is only the first trouble that Bertie finds in this trio of stories.
Fifth grader Jack finds himself the target of ridicule at school when it becomes known that his father is one of the janitors, and he turns his anger onto his father.
The students and teachers at Dublin Elementary School make banners, posters, and signs for their school custodian to show how much they appreciate him and all the work he does.