Blood Born - The Immortals, #1

Emma's brutal death at the hands of a vampire should have been the end, but a mysterious hooded stranger steps in, changing her life forever. As seventeen-year-old Emma struggles with her new vampire gifts and cravings, her grandmother isn't surprised at all. Hinting that she knew this day would always come, she leaves to get help, promising to explain everything when she gets back, but she never returns. Instead, the beautiful and enigmatic Cara, a fellow vampire, shows up at her door.
Promising to help her locate her missing grandmother and uncover her ancestry, she brings Emma to the Haven, a sanctuary for half-blood vampires. Thrust into a war between the Immortal vampires and the half-blood rogues, Emma's simple life begins to unravel as blood and secrets entwine to reveal a dark history and an even darker destiny. She'll need to survive long enough to discover who she really is and which side she wants to be on.