Anthony Steffen, as a young gunman who works as a circus performer, witnesses the killing of some outlaws, carried out by their leader and is credited with the deed.
A group of Northern vigilantes, roaming the post Civil War south, attack and kill the fiancee of war veteran Brian, who is rescued by his friend, Daniel.
Centring on the legend of the four ancient Chinese heroines, the film was a novelty for audiences at the time, as the singing performance was in Cantonese and used huangmei operatic rhythms—a popular trend in the 1960s, yet it retained traditional flavours by using operatic luogu percussion in the battle scenes.