Blood Echo

When her abusive father finally goes too far, shy seventeen-year-old Rayne Kennedy finds that her savior is far from an angel. Lost and alone she is completely enraptured by the beautiful but murderous, Scarlett. Taken on an adventure by the vampire's well-intentioned sister, Rayne is drawn into Vires, a dark and dangerous vampire world, where humans are little more than natural resources to be exploited.
In a society that has been turned upside down while learning to live inside its constraints, Scarlett Pearce may not be much more than a slave to a power-hungry Government and the violent bloodlust that consumes her may be all her own. Before she loses herself in a world unlike anything she has ever known, Rayne needs to find Scarlett and the answers to those questions.