Like most sixteen-year-old girls, Cassie O'Connell wonders what it's like to be in love. For Cassie, that question is even more daunting as ten years ago a virus wiped out every male on the planet. Well, almost every male. Cassie discovers a teenage boy, Jamie, who has been locked away in a secret isolation chamber at the lab where Amanda, Cassie's mother, works. Amanda searches for the cure to the virus-for the last ten years, she has kept Jamie hidden, to save his life and to use his blood to find a cure for the menace that still picks off male babies like a sniper. Then Cassie finds Sam,...