After some robbers make a daring heist from an armored car, a goofy cop (Aaron Kwok) manages to catch one of the criminals. But the head robber kills the prisoner, so he can't talk. Now, Kwok must solve the robbery, and apprehend the killer. He is assigned with another cop (Lau Ching Wan) to help solve the case. Things start to get out of hand when Kwok falls in love with the head criminal's girlfriend.