A teenage murder witness is drowned in a tub of apples at a Hallowe'en party.
Joyce, a hostile thirteen-year-old, had boasted 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!
It's Agatha Christie and Hercule Poirot at their finest.