Ozma of Oz

Ozma of Oz, published on July 29, 1907, was the third book of L. Frank Baum's Oz series. It was the first in which Baum was clearly intending a series of Oz books. Where at the end of The Wonderful Wizard of Oz, Dorothy's silver shoes were lost in the desert, at the end of Ozma of Oz, Glinda tells her the magic belt she could wish herself home with would likewise be lost, and Dorothy carefully gives it to Ozma, in order that she might go home but the magic still be preserved, and they arrange that Ozma will use it to wish Dorothy back to Oz at need.

It is also the first book where the majority of the action takes place outside of the Land of Oz. Only the final two chapters take place in Oz itself. This reflects a subtle change in theme: in the first book, Oz is the dangerous land through which Dorothy must win her way back to Kansas; in the third, Oz is the end and aim of the book. Dorothy's desire to return home is not as desperate as in the first book, and it is her uncle's need for her rather than hers for him that makes her return.

— Excerpted from Wikipedia, the free encyclopedia.