Lover Awakened (Black Dagger Brotherhood Series 3rd) by J.R. Ward
Somewhere in Caldwell, New York, in the shadows of the deadly nights, there exists a raging war between the vampires and their slayers. Among the vampires, there exists a secret band of six brothers and these are vampire warriors, deadly than anything in this world.
He was once humiliated and a blood slave and until now, he still bears the scars of his terrible past. Anger and fury are the only companions he has and where he steps, the earth thunders.
As he continues with his work, he happens to rescue a very beautiful aristocrat from the evil Lessening Society. Her name is Bella and the two at one point become intrigued to one another. Zsadist desires for vengeance for Bella’s tormentors, but Bella desires to free Zsadist from the fury that occupies his mind.