Lyman Frank Baum 
Rinkitink In Oz 

Wherein is Recorded the Perilous Quest of Prince Inga of Pingaree and King Rinkitink in the Magical Isles that Lie Beyond the Borderland of Oz. Baum was always one for a long sub-tile! This is the tenth book in the series and was published on June 20th, 1916. Most of the novel had been written by Baum over ten years before as a fantasy novel so almost until the end no-one from Oz appears. Most of the action takes place on three islands; Pingaree, Regos, and Coregos and within the Nome King’s caverns.