action adventure adventureandadventurers children'sfiction delphianoracle fables fantasy fantasyfiction fiction frank general gods godsandgoddesses greek greekgods greekmythology hazel heroesofolympus jason juvenilefiction legends magic mythology myths newyorktimesbestseller nyt:childrens-middle-grade-hardcover=2016-05-22 percyjackson quests(expeditions) reyna roman thehiddenoracle toa