In book 3 of the Mighty Meg series, Meg finds her nemesis in a mean boy at school who may have super-strength! After mastering her superpowers, the last thing Meg needs to become a real superhero is a nemesis! Jackson, a boy Meg remembers as small and quiet, is suddenly strong and mean! Jackson starts making fun of Meg's classmates, and even hurting some of them. Meg begins to wonder if Jackson is regular-kid strong or if he's super-strong like her, and she makes it her mission to investigate and uncover the truth behind his new strength! Does Jackson really have superpowers? Will Meg ever find out the truth behind Jackson's new strength and behavior?