L. Frank Baum 
The Emerald City of Oz 

In this sixth book of Baum’s Land of Oz series, Dorothy takes her Aunt Em and indebted Uncle Henry on a tour of Oz. There her guardians meet a wide variety of beings, from the paper dolls of Miss Cuttenclip to the pastries of Bunbury, as well as the familiar Tin Woodman, the Scarecrow, and Billina the Yellow Hen. All is not well, however, for the jealous and vengeful Nome King Roquat wishes to seize the land of Oz. The old soldier Gulph agrees to set out in search of allies for the Nome Army, and he encounters an array of disturbing creatures, from the strangely disproportionate Whimsies to the evil Phantasms. It will take the curious magic and ingenuity of the citizens of Oz to overcome the enemy and protect their precious Emerald City.