Seventeen-year-old Alys Aronson's life used to be about a lot of things: violin practice, her schoolwork, and lounging in the warmth of her boyfriend's welcoming arms. But none of that matters anymore -- not after what happened in the library that day. Not after her brother, Luke, walked through those doors with a rifle in hand and a deadly plan no one could have predicted. He spared her, though she'll never know why, but killed fifteen others before turning the gun on himself.