During the summer before fifth grade, Ferris Wilkey has her hands full with her little sister terrorizing the town, her Aunt Shirley moving into their basement and her grandmother seeing a ghost--one who has wild, impractical and illuminating plans.

Sixth grader Lucy is brand-new to middle school, and when her older sister GiGi--the undisputed queen bee of eighth grade--humiliates her in the cafeteria, Lucy snaps and challenges her to a fenncing duel.