A spooky and hilarious story from the author and illustrator team of Who Will Help Santa This Year? and Who Will Guide My Sleigh Tonight?: bestselling author Jerry Pallotta, and illustrator David Biedrzycki! It's Halloween night. While a mother is upstairs getting her daughter's costume ready, lots of trick-or-treaters stop by the house--from werewolves, ghosts, and zombies to witches, bats, dinosaurs, and more! But are they really real? Jerry Pallotta and David Biedrzycki team up again in this spine-tingling story that's as giggle-inducing as Who Will Help Santa This Year? and Who Will Guide My Sleigh Tonight?