In which the Scarecrow goes to search for his family tree and discovers that he is the Long Lost Emperor of the Silver Island, and how he was rescued and brought back to Oz by Dorothy and the Cowardly Lion.
After the death of L. Frank Baum, his publishers arranged for Ruth Plumly Thompson to become the new Historian of Oz. This was her first Oz book.
Fully illustrated with the classic artwork of John R. Neill.