Bella Legrossi and Boris Kleanitoff, the messiest and cleanest monsters in Booville respectively, do nothing but argue until the night of Harry Beastie's Halloween party. Annotation. Bella Legrossi is the messiest monster in all of Booville. Her slime is the slimiest and her grime is the grimiest. Alas, she is neighbors with Boris Kleanitoff, a persnickety ghoul so tidy he vacuums his vampire bats. What could ever bring these two together? It will...

The full moon is rising on Halloween night. Diego and Baby Jaguar go out to rescue some bats trapped in a cave and along the way encounter many different night creatures.

Summary: Pip's two grandmothers, who cannot agree on anything, take Pip and her friends trick-or-treating on Halloween.