The film protagonizes Allan, a professional bodyguard based in Beijing whose tactical and martial skills and quick thinking are well shown as having protected several statesmen from assassination. He is hired by James, a wealthy Hong Kong businessman, to protect his beautiful girlfriend Michelle Leung, who is the only surviving witness to a murder, after all the others had been eliminated in various ways. Allan arrives at the girl's home in Hong Kong to meet with two somewhat incompetent plainclothes police officers - Fat Po and Ken - in charge of her safety. Soon after meeting Miss Leung, he proves the entire contingent of current bodyguards incapable in his fight with them during what he thought was an assassination attempt, and they are all fired. He also disarms both policemen.