Since Colonel Drake found black gold and it is known that oil is a wonderful fuel, this news will trigger a new rush. In order to bring order to Titusville, Lucky Luke, commissioned by the state, is appointed sheriff. Barry Blunt, a former unscrupulous lawyer, liar and dishonest, arrives in Titusville and appropriates "legally" for one dollar, of all the oil in the area. Lucky Luke's task is complicated but thanks to the help of Bingle, a Blunt handman, he will manage to clean Titusville from his vermin!