Molly Moon is on a mission to bring her long-lost twin brother, Micky, home. But before she can rescue him she has to find him, and he could be anywhere! Luckily Molly's time-travel talents and world-stopping skills help her in her search ...until a baby-faced villain with a precocious plan to have the world's biggest brain gets in her way. Can Molly, Petula the dog and their best friend, Rocky, use Molly's new secret weapon mind reading to defeat the brainy babe and her monstrous mind machine?