The Lost Princess of Oz, by L. Frank Baum, is the eleventh book in the Oz series. Another day begins as Dorothy awakens in the Emerald City. Noticing Princess Ozma has not yet arizen, Dorothy goes into Ozma's chambers only to find she is not there. The mystery multiplies as Glinda awakens to find her Great Book of Records and her magic tools are missing. In order to help, the Wizard searches for his magic tools and finds they are missing too! Thus begins a grand search by Glinda, Dorothy, the Wizard and their companions Button-Bright, Trot, and Betsy Robbin to find Princess Ozma and the missing items. Lyman Frank Baum (1856-1919), better known by his pen name L. Frank Baum, was an American author chiefly known for his children's books, particularly The Wonderful Wizard of Oz. He wrote 55 novels in total.