Plot Summary:The DeQuettevilles and the Fleetwoods have been enemies since the English Civil War. Now the DeQuettevilles are dying, each first seeing a headless horseman. Is the ancient feud to blame? Or is there a modern murderer at large?
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.