Two strangers' worlds collide after a Beijing traffic accident results in the husband of Yu Miao shooting and killing the girlfriend of young, penniless Xu Tian.

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. Written by UEP North America