The Lost Princess of Oz begins with the disappearance of Princess Ozma, the ruler of Oz and covers Dorothy and the Wizard's efforts to find her. The introduction to the book states that its inspiration was a letter a little girl had written to Baum: 'I suppose if Ozma ever got hurt or losted, everybody would be sorry...' Well, everyone is indeed sorry; and doing their utmost to find Ozma...find out if they do in this ravishing piece of entertainment!