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.

With King Richard off to the Crusades, Prince John and his slithering minion, Sir Hiss, set about taxing Nottingham's citizens with support from the corrupt sheriff - and staunch opposition by the wily Robin Hood and his band of merry men.