Henry the unicorn is trapped in a tall tower in Fairytale Land and it's up to Izzy to save him. She's come with all her latest inventions - paper water bombs, catapults, musical instruments - but this time, her inventions alone can't save Henry. She's going to have to learn how to travel through time! Once again, Izzy must use her science skills to outwit ogres and bad fairies, this time with a little help from a bad-tempered gnome...
Zanna Davidson (also writing under the name Susanna Davidson) has been writing children's books for Usborne for nearly 20 years. She likes dogs, books and climbing trees. Follow Zanna on Instagram and Twitter at @ZannaDavidson