PierDomenico Baccalario has been writing children’s novels since 1997, when he won the Il Battello a Vapore literary prize with La strada del Guerriero (The Way of the Warrior) using his neighbour’s name. Since then, his bestsellers have been written under as many pseudonyms (the best known being Ulysses Moore and Irene Adler), translated into more than thirty languages and published with the major Italian and foreign publishers. He has collaborated with the Lucca Comics & Games organisation for more than twenty years, has written for Repubblica and is a columnist for the newspaper Corriere della Sera’s La Lettura literary supplement. In 2014, he founded the Book on a Tree creative agency in London. Today he is considered one of the most important Italian children’s authors, and the most translated in the world.