Mia has been kicked out of monster schools at every level, from Madame Cryptorius's School for the Brilliant and Bewitched to Bugwump Swamp Middle, and now she's about to face her toughest challenge yet: Human school. Her goal: Find the monster who has infiltrated this school and started picking the human kids off as prey, and she might just get let back into a monster school. All she has to do is narrow down her list of suspects. How many monsters can there be hiding in a school? (A lot, it turns out.)