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 delightful pig is back in a tale full of treats, tricky turns, hijinks, and high humor.