Wu Wan-lung is a member of the Royal Hong Kong Police Force and is temporarily interdicted from duty because he has been suffering from epilepsy. One day he coincidently spots out a robbery and has subsequently rescued a girl Mark, and also causes the three robbers at scene seriously hurt. On the other hand, Danny Lee, a Chief Inspector of the Crime Squad, ratiocinates that there will be a big hold-up involving trade of arms occurred in the near future. In the mean time, one jewellery shop is robbed by two gangsters Evan and Fat Dog. On the route of escape, Fat Dog is shot to injure and is finally killed by Evan. One day, Wu seriously hurts a man called Nut in the consequence of preventing a taxi driver from being assaulted by Nut. Nut is heartedly hate Wu and swears to take revenge. Coincidently, Nut and Evan are good friends and Evan requests Nut to become his partner in a tremendous planned robbery? (Joy Sales)