خلاصه داستان : یک گاوچران سرگردان مراقب راهزنان بزرگی است که برای دستیابی به ارث باید اعضای هیئت منصفه ای را که عمویشان را محکوم کرده اند حذف کنند.

The story opens in a Western saloon, where a young musician with a banjo begins to tell a tale of Lucky Luke and his sworn enemies the Dalton brothers: Joe, William, Jack and Averell. Luke has, once again, as he has done many times before, thrown the four outlaws into jail. The prison is also the abode of a guard dog named Rin Tin Can (Rantanplan in the original French language version).