Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Who plays Diana? Title: Dracula: Prince of Darkness Movie plot: NOTE: Sequel to "The Horror of Dracula" (1958).It is 10 years after the demise of Dracula, but local burials sill involve staking the heart of the suspiciously dead and burying them in unhallowed ground. This angers Father Sandor [Andrew Kier], abbot of Kleinberg Monastery, who is attempting to embarrass the locals into realizing the foolishness of their superstitions now that Dracula is dead. After stopping one such blasphemous burial, Fr Sandor stops at the local inn where he meets the English Kents--Charles [Francis Matthews], his brother Alan [Charles Tingwell], and their wives, Diana [Suzan Farmer] and Helen [Barbara Shelley], travelers to the Carpathians. Fr Sandor warns them not to go near the castle at Carlsbad but, as luck would have it, their carriage slips a wheel just outside that very castle.Oddly enough, it appears that they were expected as they are immediately met by a driverless carriage and taken to the castle where rooms have been readied and dinner is served by a mysterious servant named Klove [Philip Latham]. Despite Helen's misgivings, the Kents settle in their rooms for the night. Helen is awakened by a noise. Alan goes to investigate. Before he learns anything, he is stabbed by Klove. His body is suspended over Dracula's coffin and his throat slit so that the blood can drip onto Dracula's dust. Immediately, the bloody dust begins to steam and Dracula's body slowly takes shape. It is upon this grisly scene that Helen is taken by Klove and she becomes the first blood meal for the newly-awakened Dracula [Christopher Lee].The next morning Charles and Diana find no trace of Alan or Helen. Frightened, Diana goes to a nearby cottage to await Charles who returns to the castle in search of Alan and Helen. Shortly thereafter, Klove arrives at the cottage with a carriage and a story about Charles sending him to fetch Diana. Diana is welcomed back to the castle by Helen, now a vampire. Helen attempts to bite Diana but Dracula stops her. Charles interrupts this scene and battles with Dracula. When...
The answer to this question is:
Suzan Farmer