On a cattle drive to New Mexico, Lucky Luke travels through Langtry, home of self-appointed judge Roy Bean. A crook and a cheat who invents laws and concocts offences, Bean arrests Luke and confiscates his herd. But he doesn’t count on the arrival of another crook and cheat intent on poaching the old man’s game. It will be up to our favourite cowboy to sort it out and bring real law west of the Pecos River at last.

Grand Duke Leonid of Russia is in Washington to sign a commercial treaty on behalf of the Tsar. But this larger-than-life aristocrat has read too much Fennimore Cooper and wants to visit the West. The US government is forced to agree to his whim—but wisely chooses Lucky Luke to escort him to the cattle capital of the West: Abilene. A good thing, too, because the Russian Grand Duke encounters real American desperadoes on his visit!

A general amnesty puts the Daltons back on the streets, something Lucky Luke isn’t happy about. And, to make it worse, they seem to have become model citizens. It’s all an act, though, and it doesn’t take long for the stupidest quartet in the West to be back behind bars. Luke is already riding off into the sunset... But he’s not counting on a riled-up Apache tribe that attacks the penitentiary where the Daltons are locked up...

At the end of the Civil War, many former soldiers turn to a life of crime to survive. Joss Jamon and his gang are among the worst of such men. After sacking the town of Los Palitos, they arrange for Lucky Luke to be arrested for their crimes. The lonesome cowboy, a rope already around his neck, is forced to make a deal with the angry citizens: Bring the real bandits back within six months or hang.

Austrian Professor Otto von Himbeergeist arrives in the New World with some very strange ideas: Criminals are victims of their past and can be cured of their lawlessness. To prove his theories, the scientist intends to travel to the Wild West and attempt to reform the worst possible outlaws of the land. What better targets than the baddest, dumbest bandits ever, the Dalton brothers? And who will be tasked with keeping a close watch on the experiment, with some unexpected but always hilarious results? Why, Lucky Luke, of course!

Felps decides to plant lettuce on his property. But rancher Cass Caseyâs herds regularly ransack Felpsâ land... Furious, he hires Lucky Luke for protection from Casey. Felps wants to surround his property with barbed wire, which in the Old West is regarded as a provocation. And so, war is declared between the ranchers and the farmers... Lucky Luke will need all his skills as a mediator to reconcile everybody!

The Cheyenne are convinced that newly-arrived settlers have been killing the buffalo they traditionally depend on. When the Native Americans surround the 20th Cavalry’s fort, Lucky Luke realises that someone who bears a grudge against Colonel McStraggle has conveniently provided them with firearms. Worse, the traitor also knows the layout of the fort. Lucky Luke does his best to try and break the deadlock before the soldiers starve. As in other “Lucky Luke” volumes, readers discover different aspects of the United States’ conquest of the Wild West.