Vampire-Killing Prostitute

Raven, a vampire hunter who poses as a prostitute, has spent years searching for the vampire who killed her father when she was just a child. One night, after slaying another vampire, she is kidnapped by a group of people who reveal themselves to be fellow hunters. They require her assistance in finding and killing a deranged scientist turned vampire with plans to destroy the human race. But what Raven doesn't know, is that her target and their target are both the same.