Since witnessing her parents' murders at the age of eleven, Phoenix's only purpose in life has been to uphold her mother's dying words- to be strong and survive. But surviving outside of The Walls- outside of The Sanctuary- is more like a drawn-out death sentence. A cruel and ruthless city, Tartarus is run by the Tribes whose motto is simple, "Join or die."Refusing to join and determined to live, Phoenix fights to survive in this savage world. But who can she trust, when no one can be trusted? Not even herself.