Mrs. Piggle-Wiggle has gone away unexpectedly and left her niece, Missy Piggle-Wiggle, in charge of the Upside-Down House. Families in town soon realize that, like her great-aunt, Missy Piggle-Wiggle has inventive cures for all sorts of childhood (mis)behavior: the Whatever Cure and the Just-a-Minute Cure, for instance. What is a stressed-out parent to do? Why, call Missy Piggle-Wiggle, of course!New York Times--bestselling author Ann Martin brings her signature warmth and comic genius to a new character. And artist Ben Hatke brings it all to life!