Jurgen by James Branch Cabell

Next the tale tells of how Jurgen and the ghost of Queen Sylvia Tereu came into the White Turret. The Lady of the Lake was in bed: she slept unaccompanied, as Jurgen noted with approval, for he wished to intrude upon no more tête-à-têtes. And Dame Anaïtis did not at first awake.

Now this was a gloomy and high-paneled apartment, with exactly the traditional amount of moonlight streaming through two windows. Any ghost, even an apprentice, could have acquitted himself with credit in such surroundings, and Jurgen thought he did extremely well. He was atavistically brutal, and to improvise the accompanying dialogue he did not find difficult. So everything went smoothly, and with such spirit that Anaïtis was presently wakened by Queen Sylvia's very moving wails for mercy, and sat erect in bed, as though a little startled. Then the Lady of the Lake leaned back among the pillows, and witnessed the remainder of the terrible scene with remarkable self-possession.