窦胜雪(杨怡 饰)本是盐枭之女，无意中救了聂致远(马浚伟 饰)，却不知他原来是官家派来调查盐帮之探子。结果在致远的引路下，胜雪父亲(郭峰 饰)的盐帮被官兵杀过鸡犬不留。逃脱性命的胜雪独立支撑整个局面。 此时致远又再次出现，与胜雪再度相对，本来贩卖私盐是触犯王法，可是从胜雪口中，致远却发现平民此举实在是迫不得已，而且官盐交易内亦存著种种贪赃枉法。从这一点点盐，致远看到了天下百姓的困苦。
别想尖叫。没人会听到你的声音。你的每一寸肌肤……每一次心跳……都是我的！”距离死亡仅剩168小时，温拉维发现自己成了一个无情复仇幽灵的目标，而黑暗的存在每分每秒都在逼近。一个令人毛骨悚然的声音嘶哑地低语，威胁着要夺走她的生命，将她推向绝望的边缘。在绝望和孤独中，她遇到了一个眼神冰冷漠漠的女人——她是唯一一个让她对这场令人毛骨悚然的追捕抱有一丝希望的人，但她的恳求却遭到了无情的拒绝。随着时间的流逝，温拉维被迫面对过去的阴影，解开秘密，揭示出一个可怕的真相，最终走向一场无人能预见的悲剧！
他们在一次意外事件中相识，本以为只是彼此生命中的过客，却在不断逼近的危险与真相中，被迫站到同一阵线。当爱与责任、真相与救赎交织，他们必须在“刀刃之上”寻找各自的答案。
As Leo's replacement Thomas Chamberlain arrives Nikki investigates the murders of Rachel Freedman, shot in the head, and her little autistic son Nathan, who was poisoned. Nikki rejects policewoman Anne Burchett's theory that Rachel killed them both but is perturbed when an impostor, claiming to be Rachel's sister, visits the morgue. At the same time the disfigured corpse of Eva Liron is discovered, killed with the same poison as Nathan. She had been the nanny to French hot shot footballer Isaac Dreyfus and was planning to blackmail him over a sex tape of them both. Jewish Isaac is a controversial figure due to his anti-Muslim sentiments but he denies ant part in the murders. Then another victim, Isaac's agent Mousa, is discovered dead.
