From the back of the book: Be the hero of the story! What's happened to the elf Llangollyn? What terrible secret threatens the Fairy Kingdom? What perverse forces have brought back the darkness of the Mag Mor Kingdom? Seeking answers are three young heroes: Grilo, Grude and Gralha, facing terrifying monsters, deadly combat and the powerful magic of the evil Queen Mab. But only with your help will they be able to win! In this book, you will choose, as if you were one of the heroes, the direction history will take. The only chance to stop Mag Mor's revenge lies in your hands! Inspired by the great success of the film and video "Era Uma Vez...", this book is a continuation of the adventures of the heroes created by Arturo Uranga. And it's a fun and exciting challenge for all ages.