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's stealing the magic and shadows from Fairyland folk and refusing to give them back.