Gerald Vaughan-Hughes

Set during the grand, sweeping Napoleonic age, an officer in the French army insults another officer and sets off a life-long emnity... (imdb)

An excommunicated priest sets up a satanic cult that only looks Catholic on the outside. He convinces a man to sign over his daughter's soul so that she will become the devil's representative on earth on her eighteenth birthday, but as that day nears, the man seeks the help of an American occult novelist to save his daughter, both physically and spiritually. (imdb)

A British mathematician, working on code decryption, unexpectedly falls in love with another decrypter. This leads them to a complicated intrigue within the codebreakers. (imdb)