Ella's family has a BIG secret - her mummy is a fairy! But sometimes Mummy Fairy's magic goes wrong, and then it's up to Ella to help. this time Mummy Fairy and Ella decorate the kitchen with magic colouring pencils, catch a robber on Ella's school trip - and swim with real mermaids! The fourth book in this magical series for 5-7 year olds, from global bestselling author Sophie Kinsella.