During an orchestrated drug bust at a marine loading dock, Detective Stan Zedkov (Michael Rooker) kills Triad (underground society) lieutenant Peter Wei (Yau-Gene Chan). Looking to exact revenge for his son's death, crime boss Terence Wei (Kenneth Tsang) sends for professional assassin John Lee (Chow Yun-fat). Paying off an old debt, Lee has already killed two targets for Wei, and the crime boss tells him that this third and final job will settle the obligation. However, Lee's conscience prevents him from completing his final assignment: to murder Zedkov's seven-year-old son Stevie (Andrew J. Marton) before the detective's eyes. Realizing that his actions will result in retaliation against his mother and sister, Lee prepares to return to China, enlisting the help of old friend Alan Chan, a monk in a local Buddhist temple, to make arrangements to have his family moved to a secure location. Infuriated by Lee's disobedience, Wei orders his head lieutenant, Michael Kogan (Jürgen Prochnow), to lead the hunt for Lee, and has his people in China begin the search for Lee's family.