Writer by day, superhero by night. When he was eleven years old, Roberto Santiago put on a mask and a cape and took to the streets to save humanity. Since then, he has already saved two kittens, a fern and an abandoned dog. As for the rest of humanity, he's still at it. Author of the literary phenomena Los Futbolísimos [The Footballers] (more than 4 million copies sold, series translated into 13 languages) and Los Forasteros del tiempo [The Time Outsiders] (more than 600,000 copies sold), he has donned his cape and mask once more to write Los Once [The Eleven]. And Las Princesas Rebeldes [The Rebel Princesses], a mission on which he is accompanied by a powerful superheroine with X-ray eyes: Ángela Armero.