叶蔷与做高级督察的丈夫李继扬结婚近20年来，一直都感觉很幸福，直到邻居台湾女人被杀，丈 夫也从警署坠楼身亡，始知台湾女人原是丈夫的情妇，而丈夫也被认为是涉嫌贪污畏罪自杀。她和台湾女人留下的儿子小龙也被人四处追杀，原来为的是丈夫手中一本神秘的笔记本，而幕后主持人居然正是丈夫的上司……

Ip Cheung and her husband, a senior police inspector, had been happily married for 18 years. One day, Ip runs into her neighbour, a Taiwanese woman. As they are talking, three men suddenly appeared and tried to kill them. The Taiwanese woman is killed but Ip and the kid, Yen, managed to escape. At the same time, Ip's husband commits suicide. His superior suspected him of corruption. Ip finds out that the Taiwanese woman was her husband's mistress and Yen, his illegitimate son. Ip is given custody of Yen but they are unable to get along. However she will save his live when the gang go after him.