Cornucopia is undergoing transformation. The enormous wall that formerly separated the townspeople from the outer world has crumbled, and the world beyond beckons with the promise of fresh experiences. The Mob Squad were once heroes, but the grownups are still in authority, and even the most courageous child is still a child to them. Mal, the head of the Mob Squad, is still milking cows and daydreaming about the next adventure. Lenna, their sharp-eyed archer, is learning everything she can about the Overworld, but the horizon remains far. Chug, the fearless warrior, runs a business with his brother, but his reputation for smashing things has led people to label him a rotten apple.And his ingenious brother, Tok... What happened to Tok?! When the fourth member of the Mob Squad goes missing in the middle of the night, along with the majority of the town's potions, Cornucopia's elders believe they're dealing with a thief on the loose. But Tok was not about to walk away silently. And he's certainly not a potion thief! Something lot more serious is going on here. Mal, Lenna, and Chug are on their own if they want to stop it. Except for Jarro, the biggest bully in the Overworld, who is the one Cornucopian they don't want to bring along. But if they're going to locate Tok, they can't be three best friends and one jerk at the same time. They'll have to learn how to collaborate.