How the Wizard Saved Oz. Though Oscar Diggs has fought off the Wicked Witches of the East and West, he still has to be careful to make sure everyone believes he is a great wizard and not a humbug. When the Queen of the Field Mice seeks his help to find her missing mouse subjects, he agrees less she discover he is not a wizard. But to rescue her subjects, they'll have to stop the wicked witch Mombi from stealing all the magic in Oz and enslaving its people! With 24 black-and-white illustrations.