A stranger rides out of the hot desert into a small town in the wild west. The towns people are scared of him, and 3 gunmen try, unsuccessfully, to kill him. He takes a room and decides to stay. Meanwhile, a group of outlaws are about to return to the town and take their revenge - will the towns leaders convince the mysterious man to help ?

Set in Mexico, a nun called Sara is rescued from three cowboys by Hogan, who is on his way to do some reconnaissance, for a future mission to capture a French fort. The French are chasing Sara, but not for the reasons she tells Hogan, so he decides to help her in return for information about the fort defences. Inevitably the two become good friends but Sara has a secret..

Bent on unearthing the cynical traitor who sold information to the enemy and caused the death of a dear brother-in-arms, the battle-tested former Union cavalry officer, Colonel Cord McNally, teams up with a pair of ex-Confederates after the Civil War. Now, as honest friends, the three companions ride into Rio Lobo--a dusty town in the middle of the desert overcome by corruption--to bring to justice the one who sold McNally out; however, the town is rife with the betrayer's murderous cut-throats....

The Elder boys return to Clearwater, Texas for their Mother's funeral. John the eldest is a well known gunfighter and trouble follows him wherever he goes. The boys try to get back their ranch from the towns gunsmith who won it from their father in a card game with which he was shortly murdered there after but not before getting through the troubles that come with the Elders name.