The gunmen who killed five defenseless people made one big mistake. They should have killed six! John Phillip Law lives for one purpose - to avenge the massacre of his family by the four bandits who occupy positions of authority in the new "civilised" West. Now, fifteen years later, he learns that one of the gang (Lee Van Cleef) is being released from prison and is seeking the men who framed him. Together they form an unholy alliance - a dynamic duo combining raw, untamed youth and the experience only a master gun-fighter can offer in the Wild West.
Taking the identity of a dead postal inspector found on the trail, a stranger rides into a small western town and finds himself in the middle of a stagecoach robbery perpetrated by a gang of twenty ruthless desperados. Finding out the object of the heist was not a strongbox as it seemed but a solid gold stagecoach, he enlists the aid of a down-and-out old preacher and tracks down the dangerous gang and their unsuspected ally.
An Egean artist sees his younger wife and his son (from a previous marriage) making incestuous love, decides to paint such a beautiful scene on a canvas, especially with them riding her white stallion. The lovers can't know what the strange arrangements mean, and are afraid the painter suspects their relationship. When they try to leave the house, the painter's madness explodes, and Greek tragedy settles on the family.
As a child, Bill witnesses the murder of his family by four robbers. Fifteen years later, he embarks on his revenge. During his quest, he crosses paths with Ryan, an ex-con who wants the money the robbers owe him.