 The first eunuch of the emperor has managed to have a major opponent condemned to death and his family banished from the empire. In order to avoid a revenge of his victims, the eunuch sends his secret police to assassinate the deportees. The ambush is to be carried out at the inn of the Dragon Gate, an isolated place close to the border. The original plan of the secret agents is upset as several unexpected travelers - who prove to be master fencers - arrive at the inn. Very soon, and till the end of the last reel, secret agents, the escort of the deportees, mysterious travelers of all kinds, the personal guard of eunuch, the soldiers protecting the frontier, and the eunuch himself engage in ceaseless treacherous manoeuvres, frantic pursuits, and especially acrobatic sword fights in he good old tradition of the Chinese cinema.