As the FBI scrambles to save the life of the kidnapped daughter of the Chinese Consul, the diplomat hires trusted Hong Kong police detective Lee to find the girl. Unwilling to have their investigation invaded by a meddling outsider, the FBI assigns a rogue LAPD detective to keep Detective Lee away from the case at any cost. Carter, the detective, covertly embarks on a one-man crusade to solve the case, having first distracted Lee. Within hours, Carter realises he has greatly underestimated his Hong Kong counterpart, who has seen through his ruse, given Carter the slip, and landed in the middle of the FBI's investigation. Both excluded by the FBI, these two cops from very different worlds must join forces to save the young girl.