When Ruby signs her name on a mysterious club sheet in the middle school cafeteria, she doesn't expect much-maybe a boring after-school hangout, maybe nothing at all. Instead, she, Eddie, Finn, and Olivia stumble into the greatest secret their school has ever buried.Beneath Wobble Hill Middle lies a forgotten world of catacombs, hidden maps, and a machine unlike anything they've ever seen: the Chaos Collector. Some say it's a myth. Others would do anything to keep it hidden. But the kids are about to find out the truth-whether they're ready or not.What begins as a game of curiosity turns into a race against shadowy Suppressors, hidden tunnels, and the kind of mysteries no one puts on a permission slip. To survive, they'll need to trust each other, outsmart the adults who want them silenced, and discover the one thing that can truly power the Collector: the messy, unpredictable chaos of being a kid.Packed with danger, laughter, and heart, The Unfinished Club and the Chaos Collector is a middle-grade adventure for fans of secret societies, underground mysteries, and stories where the unlikeliest kids can change everything...