When Contessa Salavatori is betrayed by someone close to her, she makes a decision that changes her life forever. Heartbroken and on the verge of death, she signs a contract with the demon who saves her life. Now, as her dependence on and feelings for him grow, she begins sacrificing lovers to feed his desire for fresh souls. But when she crosses paths with a stranger who she feels a strong connection to, she finds herself on the wrong side of the demon’s good graces. Can Contessa find a way to break free from his clutches, or will she be dragged back to hell where she belongs? Don't Knock is a dark paranormal romance with triggers. Reader discretion is advised.