On the Night of the Seventh Moon — Victoria Holt

On the night of the Seventh Moon, according to ancient Black Forest legend, Loke, the God of Mischief, is abroad in the world. It is a night for festivity and joyful celebration. It is a night for singing and dancing. And it is a night for love.

Helena Trant was enchanted by everything she found in the Black Forest--its people, its mysterious castles, its legends of love.

Especially its legends of love.

Until, one day, she started to live one of them and the enchantment turned suddenly into a terrifying nightmare....