Blood Contract | Chapter 2: The Hitman in the Shadows (Vampire Thriller Fiction).

Silas, an ancient vampire bound by a curse, accepts a contract from the desperate Emma Ryland. Her intoxicating scent awakens a long-dormant hunger and echoes a tragic past. As he stalks her abusive target, Silas battles his monstrous urges, fearing her blood may either save or destroy him. He is a predator drawn to his prey for reasons far more complex than a simple kill.