Piper has enough masters in her life. She sure as hell didn't need to add a whole Vampire Council to the mix.
Unfortunately, Piper doesn't have much choice in the matter. With the leader of the Vampire Hunter's Guild has a vice grip on her life, there isn't much else for her to do but go along with his plan. Even if that plan involves taking out the head of the whole vampire organization.
With Durands still wanted for murder, Piper has to find a way to clear their names and finally be free to live their own lives. If she can stay alive long enough to succeed.