The Castle of the Winds — Jeanne Montague

Poor farm-girl Mariana is proposed to by Lord Christopher St Jules, and its off to the gloomy pile of Thornfalcon, where Christopher proffers exotic sex and studies the stars. But there are weird night noises and strange parties, all of which become nastily clear after Mariana gives birth to an undesired daughter. Finally the distraught Marianna will flee and meet Radu, prince of a small principality in Transylvania. Love and a hideaway marriage - until Christopher inevitably surfaces.....