Reynolds, D. B. (Donna B.). Vampires in America

Allegiance, the ties that bind. Friendship, duty, blood. Treachery . . . when friendship is abused, duty turns to burden, and blood is not enough. Unforgiven . . . because there are some things that can never be forgotten. Allegiance . . . Treachery . . . Unforgiven. War is imminent, and a spy has infiltrated Raphael's estate. But his target is not Raphael; it's his sister, Alexandra, whose earlier duplicity nearly cost Cyn her life. Raphael and Cyn are determined to play the spy's game, traveling to Mexico to discover who their enemy is and just how far he'll go to win. But once Raphael finds his sister, can he take the chance that she won't betray him again?

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