L. Frank Baum 
Magic of Oz 

This is the thirteenth Land of Oz book, published shortly after the authors death and dedicated to the Children of our Soldiers, the Americans and their Allies, with unmeasured Pride and Affection. In this story, the Munchkin boy Kiki Aru finds magic instructions hidden by his father, Bini Aru. The former Nome King Ruggedo, seeking vengeance against the Emerald City, allies himself with Kiki in order to conquer Oz. They play havoc with their magic, but eventually the Wizard prevails. And Ozmas birthday is celebrated; shes given the gift of a magical flower, obtained at great effort from an unusual island.