Tanith Lee 
Lycanthia 

Even in today’s world there are corners where past evils still cast their terror-haunted shadows. When the young man, Christian, came to his inheritance — a once grand mansion in just such a remote corner of France — he knew only that there was some sort of alternate claim to that ancient building and its lands. Even as the villagers acknowledged him as lord of the manor, there came two from the forest to stake out their interest. And with them came fear and desire, terror and love…a combination which could be irresistible — and also fatal.