Dorothy and the Wizard in Oz is the fourth book set in the Land of Oz written by L. Frank Baum. It was published on June 18, 1908 and reunites Dorothy with the humbug Wizard from The Wonderful Wizard of Oz. Written shortly after the 1906 San Francisco earthquake and around the time Baum moved to California, the book starts with an earthquake in California. Dorothy and others are swallowed up by cracks in the earth, and fall into an underground cavern, where begin their adventures. Little of the story, six out of twenty chapters, actually takes place in Oz. Oz is not the land where the adventures take place, but the land the characters are seeking as a refuge from adventure.