September longs for the enchantment of Fairyland and the companionship of her dear friends—Ell, the Wyverary, and the boy Saturday. Yearning to escape the dull routines of home, she dreams of new adventures.

Suddenly, she is whisked away to the moon, reunited with her friends, and faced with an extraordinary challenge. A moon-Yeti with great and mysterious powers threatens Fairyland.

Can September save the land she loves, or will its magic be lost forever?