Legally Undead - The Vampirarchy, #1

A reluctant vampire hunter, stalking New York City as only a scorned bride can. Elle Dupree has her life all figured out: first a wedding, then her Ph. D., then swank faculty parties where she'll serve wine and cheese and introduce people to her husband the lawyer. But those plans disintegrate when she walks in on a vampire sucking the blood from her fiancé, Greg. Horrified, she screams and runs-not away from the vampire, but toward it, brandishing a wooden letter opener.
As she slams the improvised stake into the vampire's heart, a team of black-clad men bursts into the apartment. Turning to face them, Elle realizes Greg's body is gone-and her perfect life falls apart.