The master and his disciple sequester themselves in their residence – Wang for recovery, Ho for some kung fu lessons. But it is nearly time for the princes to assemble for the announcement of the heir to the throne, and so Wang and Ho undertake the dangerous journey to Peking with Wang in disguise, being pushed in a wheelchair by Ho. Defeating an army of assassins in a ruined city, they manage to extract from the assassins' leader the identity of the Prince (Number Four) who is targeting Wang. The heroes then encounter their most formidable enemy, General Liang plus two other bad guys, and a climactic fight sequence follows. They manage to defeat their enemies just in time for the prince to enter the throne room in time for the Emperor's appearance. Ho, outside the door, passes his master his necklace of beads on the pole they've used during the fight; the Prince takes them and deftly uses the pole to send Ho flying outside the room. The film ends with a freeze-frame on Dirty Ho in mid-air. "Dirty Ho" does not follow the usual revenge plot of Shaw Brothers kung fu films at the time. Also, another one of the film's unusual features is having a Manchu character as the film's hero, instead of the villain.