1923. Edward Williams, gentleman and amateur golfer, lives an untroubled life as the curator of a small university museum. His speciality is the topography of the British Isles. So when an art dealer sends him details of an interesting engraving - a mezzotint - of an old country house, he’s intrigued. When the picture arrives, however, it seems perfectly ordinary - until Williams notices a figure in the picture where there was none before. A cloaked figure, with a skull-like head and legs that are horribly thin. Soon, within the mezzotint, the figure seems to be on the move across the moonlit lawn towards the house with murderous intent.