市委书记突然被杀，杀手沈洋又被人追杀灭口；走投无路的沈洋制造了轰动一时的劫机事件，刑警队重案 A组组长江楠奉命乔装医生，经过殊死搏斗，致劫犯一死一伤；苏醒后的沈洋刚对江楠供出幕后指使，却在严密监控下神秘被杀。公安内部出现内奸，谁是卧底？江楠奉命拘捕钱龙，却因没有直接证据被迫释放钱龙；江楠接到神秘电话紧急行动，却刹车失灵，致使车辆翻至沟底……
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.
