Hallowe'en Party

At a Hallowe'en party, Joyce, a hostile 13-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. That night Herculepoirot is called in to find the 'evil presence'. But first he must establish whether he is looking for a double murder or a double-murderer ...