Paul Carver, a tourist, stumbles upon a castle at night where he is treated like royalty by the wealthy woman who lives there. However, come morning, the castle and woman vanish, leaving him befuddled
The true value of an estate brings out the worst in the deceased's doctor (Christopher Lee), lawyer, sister (Joan Collins) and rightful heir (Robert Hardy).
A desperate young heiress is convinced that she's a werewolf responsible for a grizzly series of unsolved murders that have terrified the citizens of London and baffled Scotland Yard.