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!

Austrian professor Otto von Himbeergeist arrives in the New World with some very strange ideas: he suggests that 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!

Reprint of the original, first published in 1859.

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...