Shay has had a rare blood disorder since she was born. In fact, her mother married one of Shay's doctors, Martin, who left his world-renowned leukemia research to try and figure out exactly what the disorder is and how to cure it. When she turns seventeen, Martin begins to give her new blood transfusions that make her feel the strongest she has ever felt. But she also has odd visions where she sees through the eyes of a vampire. At first, she thinks...