After her husband is lynched by bandits, Michèle Mercier (Black Sabbath) seeks revenge and turns to an old friend, played by Robert Hossein, for help. A solitary figure who lives in a ghost town and dons a single black glove before each gunfight, Hossein is initially reluctant but soon infiltrates the widow's enemies to force a showdown.
Sartana is falsely accused of robbing a bank and must find the real robbers and clear his name.
Crooked bankers plan an insurance swindle and hire a Mexican gang to steal the bank's gold but they also pay Lasky's gang to kill the Mexicans.
Wily roving gunslinger Sartana arrives in a small town and tries to find a hidden fortune of half a million dollars in gold and two million dollars in counterfeit money. Naturally, a bunch of other treacherous folks who include conniving widow Senora Manassas, shrewd fellow gunslinger Grand Full,...