Twelve-year-old September's ordinary life in Omaha turns to adventure when a Green Wind takes her to Fairyland to retrieve a talisman the new and fickle Marquess wants from the enchanted woods.
After returning to Fairyland, September discovers that her stolen shadow has become the Hollow Queen, the new ruler of Fairyland Below, who is stealing the magic and shadows from Fairyland folk and refusing to give them back.
Longing for a new adventure that will reunite her with Ell, the Wyverary, and Saturday, September is spirited away to the moon and charged with saving Fairyland from a moon-Yeti who wields mysterious powers.
"A young troll named Hawthorn is stolen from Fairyland by the Golden Wind, and becomes a changeling in our world, a place no less bizarre than Fairyland in his eyes"--
After September is accidentally crowned the Queen of Fairyland, the kingdom is thrown into chaos when others come forward with claims to the throne, and to settle the matter, a Royal Race is organized whose winner will seize the crown.