When Harper's dad becomes the prime minister he's terrible at it. He was thrust into the top job after a heroic boogie-board rescue of two kids (and a labradoodle) from a shark attack, but surviving government is proving hard. Their family is a laughing stock, and Dad disappears to a 'conference' – but he leaves his phone behind. With her little sister, Lottie, Harper must secretly take his place and decide on a new policy by the end of the week. She finds herself torn between ideas – should she ban plastic bottles? Or make weekends longer? Can she prove a kid can lead the country better than a grown-up?