In this authorized edition from the Queen of Mystery, a Halloween party turns deadly, and it falls to Hercule Poirot to unmask a murderer.

At a Halloween party, Joyce--a hostile 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.

That night, Hercule Poirot is called in to find the evil presence'. But first he must establish whether he is looking for a murderer or a double-murderer...