A Wall Street Journal 20 Best Children's Books of the Past 20 Years Selection Can visions of treats entice a porcine wonder to wear her princess costume? Hold on for some Halloween havoc, Mercy Watson-style! When the Watsons decide to zip their porcine wonder into a formfitting princess dress for Halloween--complete with tiara--they are certain that Mercy will be beautiful beyond compare. Mercy is equally certain she likes the sound of trick-or-treating and can picture piles of buttered toast already. As for the Lincoln Sisters next door, how could they know that their cat would lead them all on a Halloween "parade" of hysterical proportions? Kate DiCamillo's beguiling pig is back in a tale full of treats, tricky turns, hijinks, and high humor.