Ash / James Herbert / 693 pages / Deceased Author Challenge

"Comraich Castle was a kind of sanctuary for the wealthy, so ethereal roamings of lost spirits would be almost as dire as hearing the kitchens were infected with cockroaches as far as they were concerned." Yet paranormal investigator David Ash has been summoned in response to violent psychic occurrences at the castle.  Under a binding contract of secrecy, he is to discover the cause of the hauntings and end them, if possible.  The castle is actually a prison for wealthy people who have crossed the line and must escape the known world, or a dumping ground for troublesome progeny.  Mr. Herbert's imagination knows no bounds.  We have imprisoned here the daughter of Hitler and the son of Princess Diana and Prince Charles, both of whom are afflicted.  Is their psychic energy adding to the powder keg of violent energy from past atrocities?  This is an excellent ghost story with multiple references to actual historical personages and their impact of world events.