Better in the Dark — Chelsea Quinn Yarbro

Here at last is a long-hinted-at chapter in the undead existence of the immortal Count Saint-Germain: the story of Ranegonda of Saxony, one of the three great loves of Saint-Germian's life.

937 A.D. The Saxon fortress of Leosan is under the almost unheard-of rule of a woman. The Gerefa of the fortress has become a monk, leaving his sister, Ranegonda, to rule in his name as best she can--and to deal with his embittered, headstrong wife as well. Into this tense and dire situation comes Saint-Germain. Shipwrecked on the Baltic shore, near the true death, he is found by Ranegonda, whom he will come to love for the gift of blood she gives him, and for her own indomitable spirit.