This spaghetti western presents a fictitious version of the often filmed legend of Pat Garrett and Billy the Kid. Billy becomes innocently an outlaw while protecting his mother, but then turns into a trigger happy killer. When he falls in love he tries with the help of Pat Garrett, a fatherly friend, to change back. However, circumstances force Billy to become violent again and it is Garrett who is credited with the killing.
A man comes to a western town willing to discover the perpetrators of the robbery of a bank, where a significant amount of gold disappeared and witnesses were cruelly murdered. One of the thieves is now getting rid of the accomplices, using some deadly snakes that only seem to obey him.
Macedo, bloodthirsty leader of a gang of Confederates shoots the captain of the Northerners, Jeff Mallighan, known as "Fast Hand", shattering his right hand. Jeff, wounded on the ground, could not see the face of the villain, but his silver spurs have stuck in his mind as well as his unique gun. Some time after this event Macedo continues with his misdeeds, however, a mysterious horseman dressed in black will stand in his way.
