The Lost Princess of Oz is the eleventh canonical Oz book written by L. Frank Baum. Published on June 5, 1917, it 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."
The book was dedicated to the author's newborn granddaughter Ozma Baum, child of his youngest son Kenneth Gage Baum.
Ruth Plumly Thompson borrowed the plot of this novel for her 1937 Oz book Handy Mandy in Oz. The Frogman and Cayke's dishpan re-appear in Jeff Freedman's 1994 novel The Magic Dishpan of Oz.
Dorothy has risen from bed for the day and is seeing to her friends in the Emerald City and notices that Ozma has not awakened yet. Dorothy goes into Ozma's chambers only to find she is not there.
Glinda awakens in her palace in the Quadling Country and finds her Great Book of Records is missing. She goes to prepare a magic spell to find it- only to see her magic tools are gone as well. She dispatches a messenger to the Emerald City to relay news of the theft. Receiving the news, the Wizard hastily offers his magic tools to assist Glinda, however, these are missing as well. Glinda, Dorothy, and the Wizard organize search parties to find Ozma and the missing magic. Accompanying them are Button-Bright, Trot, and Betsy Bobbin. Dorothy and the Wizard's party begins to search the Winkie Country to the west of the Emerald City.
Meanwhile, in the southwestern corner of the Winkie Country on a plateau belonging to the Yips, and Cayke the cookie cook has had her diamond-studded gold dishpan stolen. The self-proclaimed adviser to the Yips, a human-sized dandy of a frog called the Frogman, hears Cayke's story and offers to help her find the dishpan. When they have gotten down the mountain, Cayke reveals to the Frogman that the dishpan has magic powers, for her cookies come out perfect every time.
Dorothy, the Wizard, and their party enter the previously unknown communities of Thi and Herku. The citizens of Thi are ruled by the High Coco-Lorum (really the King, but the people do not know it) and repeat the same story about the Herkus: they keep giants for their slaves. In the Great Orchard between Thi and Herku, the party enjoys a variety of fruits. Button-Bright eats from the one peach tree in the orchard. When he reaches the peach's center he discovers it to be made of gold. He pockets the gold peach pit to show Dorothy, Betsy, and Trot later – despite warnings from the local animals that the evil Ugu the Shoemaker has enchanted it.
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