A murder mystery full of tricks and treats . . .
At a Hallowe'en 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 . . .