Blood Guardians (Blood Guardians #1)
They are untouched by time, and ravaged only by silver, the sun, and decapitation. They travel where they will and take to themselves humans to be their eternal companions.
One such creature, a vampire with the appearance of a young man, finds himself in a small, dusty town in Ohio in 1837. There the Blood Moon, an ancient force spoken only in legends, forces him to take a young woman to him.