Mrs. Piggle-Wiggle has gone away unexpectedly and left her niece, Missy Piggle-Wiggle, in charge of the Upside-Down House and the beloved animals who live there: Lester the pig, Wag the dog, and Penelope the parrot, among others. 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!

Ann M. Martin is the New York Times-bestselling author of Rain Reign, and many other award-winning novels and series, including the much-loved Baby-Sitters Club. She lives in upstate New York.

Annie Parnell worked for nearly a decade with some of the most successful writers and producers in television. Today she works as a mommy, photographer and writer, and lives in Los Angeles with her husband and their two children.

Ben Hatke is the author of the New York Times-bestselling Zita the Spacegirl trilogy as well as the picture book Julia's House for Lost Creatures. He lives and works in the Shenandoah Valley with his wife and their boisterous pack of daughters.