When the Watsons decide to zip their beloved porcine wonder into a bright pink, form-fitting princess dress—complete with a sparkling tiara—they are absolutely certain that Mercy looks beautiful beyond compare. Mercy isn't so sure about the dress, but she is very interested in the sound of trick-or-TREATING! In her mind, Halloween means one thing: towering piles of warm, delicious buttered toast. But as Mercy sets out on her royal quest for snacks, the Lincoln sisters next door have no idea that their mischievous cat is about to crash the party. Soon, the entire neighborhood is swept up in a wild, hysterical Halloween parade! Hold on tight for some serious holiday havoc. Packed with tricky turns, unexpected treats, and high-speed hijinks, this laugh-out-loud adventure proves that a pig in a princess dress is always a recipe for disaster!