The Enchanted Island of Yew

. . . where the most unusual opportunity presents itself: the chance to transform an immortal being into a mortal. Before her eyes appears a handsome young knight: Prince Marvel. Setting out in search of adventure, he finds it aplenty on the enchanted isle, as he soon meets King of the Thieves Wul-Takim, and the fearsome giant, Red Rogue. An innocent among mortals though he is, Prince Marvel sets things right -- or maybe just topsy-turvy! The Island of Yew is set at some undisclosed place "in the middle of the sea." Later commentators have sometimes placed it in Baum's Nonestic Ocean with the landmass that contains the Land of Oz and its associated countries but the book itself does not reference this.