From the publisher:
Three emerald necklaces cause everyone in Oz to forget all about Princess Ozma, the Wizard, and Glinda the Good and acknowledge instead a fat old king named Skamperoo as supreme ruler! The mystic enchantment is responsible as well for the appearance of the glorious Wishing Horse, the most magnificent white steed imaginable.
Only Dorothy and Pigasus, the flying poetical pig, can save the realm. . . .
