When Milo's uncle and Tilly's grandfather are poisoned by a mysterious copy of The Wizard of Oz and fall into a deep sleep, Milo and Tilly travel to the Emerald City to find out who is behind the poisoning.

After the defeat of one Wicked, the other Witches of Oz prepare for vengeance in this second book of the Ages of Oz series! Glinda and her friends have successfully vanquished Aphidina, the first of the four Wicked Witches. But her task is far from over. With the fate of all of Oz hanging in the balance, Glinda struggles to locate a mysterious teacher called Mythra, who is the only one who can guide her in reaching her mystic potential and becoming...

After a cyclone transports her to the land of Oz, Dorothy must seek out the great Wizard in order to return to Kansas.