Dance with the Devil (Dark-Hunter World) - Sherrilyn Kenyon

Zarek is the most dangerous of all the Dark-Hunters. He endured a lifetime as a Roman slave and centuries as a Dark-Hunter in exile. Zarek trusts no one. Because of his steadfast denial to follow any orders, he is kept in isolation in Alaska where his activity is seriously limited and closely monitored. There are many who fear he will one day unleash his powers against humans as well as vampires. Have nine hundred years of exile made Zarek too vicious to be redeemed? The gods want Zarek dead but reluctantly agree to allow justice goddess Astrid to judge him. Astrid has never yet judged a man innocent, and yet there is something about Zarek that tugs at her heart. He views even the smallest act of kindness with shock and suspicion. But while Astrid struggles to maintain her impartiality in the face of her growing attraction to Zarek, an executioner has already been dispatched...