L. Frank Baum 
Dorothy and the Wizard in Oz [EPUB ebook] 

An earthquake sends Dorothy and her California friends, Zeb, Jim, and Eureka, tumbling down a crack and deep beneath the earth. There she runs into her old friend, the Wizard of Oz. Together with the Wizard and his troupe of piglets, Dorothy and friends travel through many fantastical lands, such as the Valley of Voe, where fruit has turned the entire population invisible. After a run-in with flying Gargoyles, Dorothy and friends finally reach the Land of Oz, where she reunites with Scarecrow, the Tin Woodman, the Cowardly Lion, Princess Ozma, and the wooden Sawhorse.