Vampire

I am a vampire. I feed, I fight, I follow orders and I am good at my job.
However, I once betrayed my Master and paid a heavy price. He loves me but can he trust me? For I am torn between nature and nurture.
I now have to question my very existence in order to save humanity and vampire kind from the strangest threat yet. The demons in hell, the fallen angels, have decided to return to the Host and the only way they can do that is by killing us all. Lucifer has decided to use me to stop them.
Can I prevent this madness if I find a way to survive the insanity and recover true compassion once more? Not an easy task for a monster, who just wants to follow her hunger.