Harry Potter or Percy Jackson? J. K. Rowling or Tolkien? Maybe you don't have to decide between the best-selling children's books in history. Piedras Verdes has arrived, a universe of adventure, suspense and fantasy that will drag you between two worlds at war. The one where four kids think this will be a normal summer until they discover the dark secret that Piedras Verdes has hidden. And that of Abhad, the shipwright who one day meets a warrior bard and Elbeïm the wizard. The Red King, who everyone believed dead, will be reborn with more power than ever to take over the Four Kingdoms.