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?