Bumbling Hong Kong detectives Lui (Kenny Bee) and Leung (Tony Leung Ka-Fai) go undercover in an apartment complex to keep watch over Pearl Chan (Carina Lau), a high school teacher who is suspected to be connected to a rare diamond theft involving a notorious thief named Mr. Mickey (Simon Yam). Meanwhile, the legendary Black Rose (Veronica Yip) appears and is also in pursuance of Mr. Mickey, wanting him to surrender himself and the diamond in order to clear her name.
Two Supreme Court Justices have been killed. Now a college professor, who clerked for one of the two men, who's also having an affair with one of his students, is given a brief by her, that states who probably, wanted to see these two men dead.
This outrageous time-travel comedy follows the misadventures of a wacky medieval knight (Jean Reno) and his faithful servant when they are accidentally transported to contemporary times by a senile sorcererMayhem rules as these 12th-century visitors try adapting to the wildly confusing modern world.