Vampire of the Mists (Ravenloft, Book 1)

Jander Sunstar, an elven vampire from the Forgotten Realms world, is pulled into the newly formed dark realm of Ravenloft and forges an alliance with the land's most powerful inhabitant--Count Strahd Von Zarovich, himself a newly risen vampire. But as Jander teaches the Count the finer points of being undead, he learns that he is tutoring the man that drove his lost love insane!