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.

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.

September has been crowned as Queen of Fairyland but the Kingdom is in chaos. The magic of a Dodo egg has brought every King, Queen, or Marquees of Fairyland back to life, each with a claim on the throne and their own plots and histories. In order to make sense of it all, and to save their friend from a job she doesn't want, A-Through-L and Saturday devise a Royal Race, a Monarchical Marathon, in which every would-be ruler will chase the Stoat...