Black Venom — Tamara A. Lowery

Mere Venoma Noir, the fourth Sister of Power, proves to be the most challenging yet for Viktor Brandewyne. She sets him to retrieve an amulet stolen by a notorious slave trader with a reputation for ruthlessness to rival Viktor's and a talent for black magic. She also possesses the power to turn the siren, Belladonna, against him, and the Sister will use every tool and opportunity she can to kill the pirate-turned-vampire before he can complete his quest.