The Festival favourite author/illustrator returns to talk about How to Train Your Dragon, and give the Hay audience a sneak peek of her first new project in 18 years. Fantasy, magical adventure The Wizards of Once will be published in September. Cressida will read an exclusive extract and show illustrations. The ‘world-conquering’ How to Train Your Dragon (also a film and TV series) has sold eight million copies worldwide and is on Hay’s list of 30 books for 30 years. Unmissable!