Sins of the Blood by Kristine Kathryn Rusch

Finally, Kristine Kathryn Rusch's graphic tale of a world overrun by vampires gets a new life of its own.
When she was a little girl, Cammie drove a wooden stake through her father's heart to save her brother Ben's life. Separated by the system, Cammie lost track of Ben. Now Cammie works as an eradicator, a vampire slayer for a privately funded organization. But she can't forget her brother. She leaves her job and her home to discover what happened to Ben.
Instead, she discovers what price she paid for her own survival. She learns about her family, and its legacy. She learns what it really means to have sins of the blood.

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