The bandit Bill San Antonio (Frank Wolff) robs a train, kills everybody inside and flees to hide the money. Gunman Cat (Terence Hill) and insurance agent Earp (Bud Spencer) chase the bandit, determined to find out where the money has been hidden. Following a feeze-out card game, Cat is trapped into a shoot-out with San Antonio in which he is led to believe that he has killed his adversary, but unknowingly he has been handed a gun with blanks ...