Lucky Luke becomes the Sheriff of Daisy Town and runs out all the criminals. Then the Dalton brothers arrive and try to get the Indians to break the peace treaty and attack the town.

After a series of vicious crimes by a renegade group of cowboys, led by "Red Jack" Stilwell, a legendary tracker, Noble Adams is pulled out of retirement to capture Stilwell, dead or alive. Reluctantly, needing more men, he allows his son, Tom to tag along, revealing to Tom a whole brutal side of ruthlessness Noble thought he left behind.