#18 Darkling by Yasmine Galenorn

This is the third book in the series and the narrator for this one is the youngest sister, Menolly the vampire. She was turned years before the series started and has sworn revenge upon her vampire sire. So of course in this book her sire comes back to help the demons find the seals to take over Earth. Menolly is the most straightforward of her sisters but this always doesn't help her. This book has her confronting her past and overcoming the trauma of being turned into a vampire. The series is a fun read and I'll be continuing it for a while.