Fifth brother is separated from his kin whilst fighting the marauding Lao, and is nursed back to health in a monastery. He is befriended by Grinder, a monk whose job is to mill wheat. Fifth brother assumes the name of Ming Sau, and works on improving his fu. He is alternately helped and distracted by pretty Yue Lan. Meanwhile, the treacherous Lao continue their plans for conquest.

After the murder of two kung fu experts, Bruce, a Police Inspector from New Zealand, decides to get involved in the case despite only being on vacation in Hong Kong. At the scene of the most recent murder, the victim managed to tear off a Buddha pendant from the killer. The link between the two murders is the strange markings on the victims neck. Bruce retraces the victims final footsteps and the search leads him to tracking down experts in Iron Finger Kung Fu.

A renowned boxer and his American wife return to Japan where he must engage in a bloody battle to protect her.