Mr. Wu (Andy Lau) is kidnapped in Beijing by Zhang Hua (Wang Qianyuan) and three accomplices, all disguised as cops and demanding a ransom of 3 million RMB. In the ensuing 20 hours, the Chinese detectives led by Chief Xing (Liu Ye) quickly form a task force and sweep the city. Time is of the essence as Mr. Wu is ordered to be killed at 9 PM regardless of whether the money is collected or not. The police eventually apprehend Hua alone. As the deadline approaches, the detectives and captors collide.