Slider Sound Books: Boo!Move the sliders back and forth to see and hear all the spooky characters come to life in this delightful Halloween treat! 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