After being captured during a bank robbery, a cowboy is sent to a prison located in a swamp, where he contracts malaria. He soon escapes and, with the help of a Mexican, sets out to track down his partner, who escaped from the bank robbery with all the money.

Once again billed as Montgomery Wood, Giuliano Gemma plays a civil war soldier who returns to his family land to find his family decimated, his property taken over by a family of Mexican bandits and his fiancee about to marry the Mexican gangster behind all this. Bent on revenge, he goes undercover disguised as a Mexican and discovers he has a daughter!

After a stagecoach is robbed and the passengers murdered, a long and tangled series of surprise attacks and murderous double-crosses, leaves the coach’s strongbox in the hands of the killer Lasky. It is up to the legendary hero Sartana to track down the missing money and determine just who is ultimately behind the grisly robberies and killings.

Giuliano Gemma stars as a cool, cocky mercenary enlisted by a sheriff to infiltrate a ruthless gang of outlaws. Ennio Morricone provided the score to this early spaghetti western hit.