While the Civil War rages between the Union and the Confederacy, three men – a quiet loner, a ruthless hit man and a Mexican bandit – comb the American Southwest in search of a strongbox containing $200,000 in stolen gold.

The tough gun-man Burt Sullivan (Franco Nero) leaves his job as a town sheriff to go to Mexico to find the man, Cisco, who killed his father many years ago. He and his younger brother arrive in a small town where everybody is afraid of Cisco who has become the local landowner. But there is a secret. It turns out that Cisco is the father of Burt’s younger brother and Cisco are craving for respect from his “son”. Burt Sullivan joins forces with the local townspeople to stop and bring Cisco back to his punishment in Texas.