Twilight’s Herald by T.A. White

Aileen Travers thought she had it all figured out. Part private investigator, part fixer to the supernatural community, she was slowly building a reputation as the go-to vampire in Columbus. If you had a supernatural problem and nowhere to turn, she was the girl for you. The best part—no one had tried to kill her in weeks.

Aileen’s peaceful existence comes crashing down around her when an unwilling visit to the police station results in her picking up a stalker—or two. Now, Aileen is dodging suspicious looking portals while evading kidnapping attempts.

Looks like Aileen has a new client. Herself.