At a Halloween party, Joyce-a surly thirteen-year-old-boasts that she once witnessed a murder. When no one believes her, she storms off home. But within hours her body is found, still in the house, drowned in an apple-bobbing tub. Famed detective Hercule Poirot is called in to investigate. Set against a night of trickery and the occult, it's up to Poirot to uncover the real evil presence responsible for this ghastly deed.