What would you do if you woke up to find all the grown-ups had disappeared? If you're like Lucy Dungston, you'll do anything to get to the bottom of it. With no grown-ups, chaos descends on Lucy's town. Kids are running wild, building roads of trampolines and eating cereal for every meal - but Lucy wants her mum back, and nothing is going to stop her. Not even the monsters who live in the upside-down world beneath her bed... Tom Fletcher's bestselling story is packed with stinkerful black-and-white illustrations by the disgustingly talented Shane Devries and is perfect for kids to read independently or together with a grown-up!