Dragon’s Claw by Karen Chance

Everyone knows that vampires are hard to kill. But when Dory Basarab is called to a crime scene in a smelly basement in Queens, she discovers that that may no longer be the case. Somebody has developed a new weapon, a vamp killer, and left her plenty of clues to follow. One of them leads her to the other side of the world, and to a city like no other, where the paranormal is normal and where death stalks the streets. Can she defeat a clever killer before he kills again, and on an unprecedented scale?