Blindsided — K.D. Grace

In New York City, away from those she loves, living with the enigmatic vampire, Desiree Fielding, Susan Innes struggles to come to terms with life as a vampire whose body serves as the prison for a deadly demon. When Reese Chambers arrives unexpectedly from England, desperate for her help, she discovers that Alonso Darlington, his lover and her maker, has been taken captive and Reese has been warned to tell no one but her. Before the two can make a plan, Susan receives her own message from a man calling himself just Cyrus. He not only holds her maker prisoner, but also her lover, the angel Michael. If she wishes to see either of them alive, she'll come to him and not tell Magda Gardener, the woman they all work for and fear. With no help coming from Magda or her Consortium, Susan and Reese must turn to the Guardian - the terrifying demon now imprisoned in her body. He alone can help them, but how can she possibly trust him after all he's done?