Zhao Wenzhou (Chiu Man-cheuk) stars as Brian Cheuk, the Mainland's foremost security expert, who demonstrates his qualifications by single-handedly defeating a squad of baton wielding guards hidden throughout a Shenzhen high rise. While travelling to Hong Kong, Brian experiences car trouble and hitches a ride with truck driver Charles (Anthony Wong Chau-sang), whose wife has recently taken their son. The woman's new boyfriend, gangster Chiu Chung-tin (Lung Fong), couldn't care less about the boy (who is really his biological offspring) but stands to gain a $US1 billion inheritance if he shows up in America with a son before his terminally ill father passes on. With the justice system unwilling to offer him any help, Charles (a former soldier left out in the cold when the 1997 unification took place) takes the law into his hands. Teaming up with some of his old army buddies (including Lam Suet), Charles takes control of the Ching Yee Primary School and holds the staff and students hostage, demanding that his boy be brought to him before 7PM.