Chow Sing Sing is about to be kicked out of the Royal Hong Kong Police's elite Special Duties Unit. But a senior officer decides to give him one last chance: Star must go undercover as a student at the Edinburgh High School in Hong Kong to recover the senior officer's missing revolver.
Scientists install a micro chip, called Black Cat, inside the brain of a violence prone girl named Catherine in an attempt to refine and control her fits of rage. Their plan is to turn her into the perfect government secret agent "killing machine".
