At a Hallowe'en party a lying-thirteen-year-old brags that she had once seen a murder. Only one person, the murderer, believes her and when she bobs for apples she doesn't come up. Hercule Poirot must reach into a past in which a number of seemingly separate crimes—a knifing, a forgery, a disappearance—become interrelated. Miss Christie even winds up on the wilder shores of mythology in this one and her Hallowe'en Party is a predictably spooky business.