The Royal Book of Oz (1921) is the fifteenth in the series of Oz books, and the first to be written by Ruth Plumly Thompson after L. Frank Baum’s death. Although Baum was credited as the author, it was written entirely by Thompson.

The Scarecrow is upset when Professor Wogglebug tells him that he has no family, so he goes to where Dorothy Gale found him to trace his “roots.” Then he vanishes from the face of Oz.

Dorothy and the Cowardly Lion mount a search for their friend, but when that is successful, they will need to become a rescue party!

Dear children: Do you like Elephants? Do you believe in Giants? And do you love all the jolly people of the Wonderful Land of Oz? Well then you'll want to hear about the latest happenings in that delightful Kingdom. All are set forth in true Oz fashion in "Kabumpo in Oz," the sixteenth Oz book. Kabumpo is an Elegant Elephant. He is very old and wise, and has a kindly heart, as have all the Oz folks. In the new book you'll meet Prince Pompa, and Peg Amy, a charming Wooden Doll. There are new countries, strange adventures and the most surprising Box of Magic you have ever heard of. Ruggedo , the wicked old Gnome King, does a lot of mischief with this before Princess Ozma can stop him. Of co...