L. Frank Baum 
Emerald City of Oz 

Dorothy, the primary protagonist of many of the previous Oz books, speaks freely of her adventures to her only living relatives, her Aunt Em and Uncle Henry. Neither of them believes a word of her stories, but consider her a dreamer. Later, it is revealed that the destruction of their farmhouse by the tornado back in "The Wonderful Wizard Of Oz" has left Uncle Henry in terrible debt. In order to pay it, he has taken out a mortage on his farm. If he cannot repay his creditors, they will seize the farm. He is not afraid for himself, but both he and his wife, Aunt Em, fear very much for their niece’s future. Dorothy arranges with Princess Ozma to take them to the Land of Oz, where they will be safe. Using the magic belt (a tool captured from the jealous Nome King Roquat), Ozma transports them to her throne room. They are given rooms to live in and luxuries to enjoy, including a vast and complex wardrobe. They meet with many of Dorothy’s animal friends, including the Cowardly Lion and Billina, the Yellow Hen… (Excerpt taken from Wikipedia)