The Lost Princess of Oz

Dorothy awakens one morning to discover that Princess Ozma has disappeared, along with several magic items belonging to Glinda and the Wizard. A search party comprising Dorothy, the Wizard, Betsy Bobbin, Trot, and Button-Bright is formed, and the friends set off for the land of the Winkies. But who is behind the mysterious disappearances? The eleventh in the Oz books series, this book has a plot that was inspired by a letter from a young fan.