On the same night his wife gives birth to their fist son, Triad mob boss Hung (Andy Lau) learns that an assassin plans to kill him within the next 12-hours. Encouraged to leave town by his best friend Lefty (Jacky Cheung) and three untrustworthy lieutenants, Hung decides to stay and makes plans to protect himself and his family. Meanwhile, two low life-gangsters are collaborating to rise up through the ranks and as the dawn approaches, the streets of Hong Kong are about to see a whole lot of action.