The Master Key (1901) is a children's novel by L. Frank Baum. Published the year after the first installment of his beloved Wizard of Oz series, The Master Key is one of few works by Baum set outside of the magical Land of Oz. This book is a testament to the heartfelt imagination of one of America's finest authors in the genres of fantasy and children's literature. "Here is a fairy tale founded upon the wonders of electricity...