Return to the town of Little Spring Valley in this new series of illustrated chapter books for readers 7 to 10, based on the classic Mrs. Piggle-Wiggle books. "Betty MacDonald's beloved Mrs. Piggle-Wiggle always had one-of-a-kind ways to remedy children of their annoying or impolite habits. Now, nearly 70 years later, her singular magic can enchant a new generation, thanks to this delightful contemporary follow-up from [Ann] Martin, writing with MacDonald's great-granddaughter, [Annie] Parnell."—Publishers Weekly (starred review)

In this first novel of the series, the magical Mrs. Piggle-Wiggle has gone abroad and left her great-niece Missy Piggle-Wiggle in charge of the Upside-Down House and the animals who live there, including Lester the pig, Wag the dog, and Penelope the parrot. Families around town soon find that, just like her great-aunt, Missy has inventive cures for all sorts of bad habits and misbehavior, from the Whatever Cure to the Just-a-Minute Cure.