The Cull — Eric J. Gates

Amy Bree's reckless actions result in death and her dismissal from the FBI. A visit from a mysterious priest propels her back into the fray, as she is partnered with an ex-spy, with fearsome computer skills, and tasked to hunt down and kill the serial killer known as the Blood Sucker. Their quarry is not what they expect: old, very old, and needs blood to survive. The body count rises… and the hunters become the hunted! Book 1 in 'the CULL' series