Usborne Slider Sound Books: Boo!From wailing ghosts to cackling witches, from rumbling thunder to a howling wolf, this irresistible novelty book is full of fun and spooky surprises. When you move a slider you'll see and hear a Halloween creature but there's more! When you move the same slider back in the opposite direction, a completely different spooky sound will happen as another creature pops into view. With endearing illustrations of the different beasties and exciting sounds,