一宗枪杀案，便衣沙展高力基(罗仲谦饰)遇上「木独」又「棘手」的目击証人李浩帆(韦家雄饰)。力基被指派贴身保护浩帆，两人由陌生与抗拒，渐渐接受对方。此时，由浩帆做大股东的成衣公司被发现卷入犯罪交易，公司高层叶长乐(刘江饰)、叶明钧(徐荣饰)父子牵涉其中。力基联同浩帆，以及其任职大律师的妹妹李颂盈(张曦雯饰)合力追查，期间力基、颂盈产生纠缠不清的感情，力基的姊姊高咏音(张文慈饰)亦与浩帆成为斗气冤家。命运将四人拉在一起，而一宗廿多年前的悬案，也因此再次掀开序幕……
Already on opposite sides of Michael Hewes's custody suit against his mother, Patty Hewes (Glenn Close) and Ellen Parsons (Rose Byrne) prepare to face off in court after a cyber-hacker's revelations about insider trading expose damaging personal information that push an informant over the edge.
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.
主妇花惠（中村百合香 饰）与丈夫弘树（佐野玲於 饰）及4岁女儿看似幸福，却面临着丧偶式育儿与长达5年的“亲密关系缺失”。深感不安的花惠主动求爱却被拒，积怨爆发之际，丈夫竟提议：“虽然我爱你……但你可以去外面寻找慰藉，无论是身体的需求还是内心的孤独。” 为了维持家庭圆满，花惠在丈夫的默许下，开始通过前男友、交友软件等途径寻找情感寄托。然而，“只要能发泄欲望就行了吗？不，我想被自己发自内心深爱着的人来满足。” 她的这份心愿究竟会走向何方……
