In a twisted , unfair reality, 14 year old Cassia must fight for everything anyone now believes can't run out. Air. With just one place to breathe, life is tough. But she never could have thought of what happens next, when she meets a strange, new boy who rebels from the destroying Society and is different from anything Cassia has ever known. He seems to protect and want to kill her at the same time, going against everything she has ever known. A forbidden romance in a strange, dead, diaphanous world where rules are strict and reality is harsh, what can Cassia do to survive and can she trust a boy who rejects all her beliefs? All she knows is that she must Breathe. She must live.