Annie Barrows' pint-sized adventurers have captured the attention of young listeners eager for clever and witty stories. Barrows has received multiple accolades, including a starred review from Booklist and glowing praise from School Library Journal. In their fourth outing, bookish Ivy and rambunctious Bean must outwit the most awful babysitter ever-Bean's older sister Nancy. Ivy uses all of her smarts to rescue her best pal, and soon the two are hatching a plan to prove to the world that Nancy is at least a million times worse than any other babysitter.