Princess Sapphire and Emerald the Witch live in the mixed-up land of Mixtopia, where everything is just a little bit odd. let's face it, perfect princesses and scruffy witches are not usually best friends.In this fourth adventure, it's time for the Halloween festival at St Aubergine's School. . . Magical fun and chaos ensue and the reader can draw, design, colour and doodle to help the story along.