When Bentham DeQuetteville falls to his death from a roof after seeing a headless horseman, his aristocratic family seem more concerned about their forthcoming Civil War re-enactment than the incident. As Barnaby and Jones try to find out the truth behind the ghostly figure, their investigation uncovers shocking secrets about the DeQuettevilles(艺术本来是弥补人生和自然的缺陷的，一切美的事物，都需要我们自己去发现和经营。)