When Ally was nine, she witnessed the brutal murders of her mother and sister. Dismissed as delusional, she has spent the last eight years honing her body into a weapon, mastering martial arts, and relentlessly tracking down the assassin no one believes exists. With the help of a boy she meets at a troubled youth center, they begin piecing together what happened that night. But their efforts to expose the truth go horribly wrong, uncovering a corporate conspiracy that stretches far beyond her family's murder. Now, Ally must become more than an agent of revenge. She must become the city's reluctant protector, sacrificing everything to protect the people she's come to care for, and finish what her mother started... unless the assassin finds her first.