Path of the eclipse: A historical horror novel, fourth in the Count de Saint-Germain series Hardcover – January 1, 1981 by Chelsea Quinn Yarbo 
 
There is trouble in 13th century China. A wind blows from the west and has a name--Jenghiz Khan. Pledged to help a beautiful woman warrior, St. Germain has a terrible secret--he has the power to bestow death or eternal life as a vampire.
 
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