Hearts In Darkness by Keri Arthur

Life has never been so insane for Nikki James. There's another teenager missing. She has another vampire to contend with. Her partner and best friend Jake is in the hospital dying. And a madman is kidnapping the wealthy.

Just when it seems nothing else could possibly go wrong, Michael returns-but not for her. This time, however, Nikki has no intention of running from either the case or from what still lies between her and Michael. And she isn't going to let him run, either.

The last thing Michael Kelly needs is a confrontation with Nikki-especially when his control over his bloodlust is still so tenuous. But when a kidnapper steps up his agenda to murder, he's forced into a partnership with Nikki to keep her safe.

Soon Michael discovers the biggest danger he faces may not be from his need to "taste" her, but from his desire to make her a permanent part of his life-a life that is sure to get her killed. Nikki is determined to make Michael see that life apart is worse than death. But before she can make him see the light, a specter from Michael's past rises that could destroy any hope she has of a future with him. Because this time the threat isn't physical. It's a matter of the heart. Nikki must compete with the woman-the vampire-for whom Michael gave up life.

This book is part of the "Nikki & Michael" series.
Here are some other books from this series: