title: Sinner
author: Eicher, Cammie
description: A century-old curse. A centuries-old killer. Thirty days to protect the world's oldest society.
  Natasha’s prior encounters with the vampire Ancients have led to a unique assignment working with an enforcer and the high elder's goddaughter. Their goal sounds simple: To stop the Ancient madman who's murdering his own people.
  The arrival of Fin Underwood, a fellow agent with Guardian Security, complicates things for both of them. But it isn't until Natasha is snatched by the very vampire they seek that Fin realizes how much Natasha means to him...and how slim a chance she has to stay alive.