The Silver Princess in Oz

A novel published in 1938. Young King Randy of Regalia and his friend Kabumpo, the Elegant Elephant, journey to visit the Red Jinn in the Land of Ev. Along the way, they encounter Planetty, a mysterious silver princess from another planet, and her fire-breathing colt. Upon reaching their destination, they discover their friend has been overthrown and enchanted by a treacherous slave,