Lost Princess of Oz (version 2) by L. Frank Baum

Oh My Goodness !!! Princess Ozma is missing and no one can find her. The whole kingdom of OZ is upset and our heroes must set out to brave many dangers and adventures to search for their beloved girl ruler. When Princess Ozma mysteriously disappears, four search parties are sent out, one for each of Oz's four countries. Most of this delightful book covers Dorothy and the Wizard's efforts to find her. Meanwhile, Cayke the Cookie Chef discovers that her magic dishpan (on which she bakes her famous cookies) has been stolen. Along with the Frogman, they leave their mountain in Winkie Country to find the pan.