Insurance agent Shun is called to visit Tak's home to follow up on a life insurance policy, and shocked to see his son's corpse hanging above him. Shun begins to suspect Tak may have murdered his son for the insurance money.
保险经纪叶永信(陈家乐 饰)被神秘客户指定跟进保单,上门拜访时亲眼目睹客户儿子吊死在半空,正直的他认定客户为诈取保险金而滥杀儿子,决心向朱重德(黄秋生 饰)和沈子玲(林嘉欣 饰)夫妇展开追查,一心将犯人绳之于法,没料这颗正义心成为敌人反击的筹码,当永信以为逐步迈向真相的同时,恐吓事件接二连三地发生,危险向他以及身边的人逼近,一度深化他对犯人的恨意,逐渐迷失在善恶之间。