Paradox in Oz — Edward Einhorn

OZ IS AGING! Ozma, the lovely girl ruler of Oz, must find a way to restore the enchantment that keeps her people young and vibrant. A lovable but puzzling Parrot-Ox named Tempus carries Ozma back through time to seek the source of the aging enchantment. Ozma meets strange versions of her closest friends in an alternate timestream: Glinda, the Wizard, the Cowardly Lion, even Ozma herself! Along the way Ozma gains new allies in her quest: the irrepressible Dr. Majestico, the sympathetic Brussle, and the lovely Princess Ayala. Come journey with Ozma on her greatest adventure as she discovers the final amazing secret that involves the old witch Mombi, a city where nothing is what it seems, and the paradoxical future-history of The Man Who Lives Backwards.