The Vampire Legacy by Tricia Barr

A ghost from the past returns with a vengeance.

Nicholae Albaric thought he had killed the powerful beauty, Ariana, over a hundred years ago. He should have burned her remains, because she’s returned, and her plans for him and Crimson are diabolical, as for the rest of the world. When Ariana abducts Nicholae and brainwashes him into being her consort, Crimson is left with nothing. Ariana’s power and influence are increasing, and only Crimson stands against her.
How will she save the world from Ariana’s wicked dominion? And will she have to kill the only man she’s ever loved to do it?