From powerhouse author Ann M. Martin, this third book in a delightful series and revitalization of a classic series is sure to draw in readers both new and old. Once in a generation, the Effluvia strikes and it affects everyone differently. Missy wakes one morning to find the upside-down house is . . . right-side up? It's not long before Missy has to quarantine the house. Meanwhile she's still fielding calls from worried parents, and Louie can't keep his sticky fingers from taking other people's things! But Missy's magic cure might just do the trick, and even teach some valuable lessons along the way.