The village of Cornucopia is practically perfect in every way. Plenty of food, cosy homes, and a huge wall to keep everyone safe from the scary world outside. What more could a kid possibly need? Well, a lot, actually. Mal, a fearless girl, needs adventure, and her friends are right there with her: Lenna, a dreamer whose family underestimates her every day. Tok and Chug, brothers who love to build stuff (Tok) and smash stuff (Chug). They're best friends, and in a town whose grown-ups value safety over bravery-and fitting in over standing out-they're the bad apples. But when a mysterious mob sneaks past Cornucopia's defenses, the village is in huge trouble. And nobody knows what to do. Finally faced with the adventure she's always wanted, Mal and her friends defy the rules their elders have always followed and set out beyond the wall for the first time. On their journey across the Overworld, they discover wonders they've never dreamed of and dangers they've never imagined. To save the day, they'll have to prove they're more than bad apples. They're the Mob Squad!