A Different Hunger by Lila Richards
In 1875, after Rufus de Hunte is challenged to an illegal duel, his father, to avoid scandal, banishes him to New Zealand. During the voyage, he meets the intriguing Serafina Radzinskaya and finds himself falling in love with her, only to discover she is a vampire. Torn between love and horror, Rufus becomes embroiled in an ancient vendetta in an attempt to save the love of his life.