In this new volume, Lucky Luke has to clean out a whole city, Fentown Town, named after Dean Fenton, the desperado who has taken it over after it was abandoned by its founding pioneers. Fentown Town has become the most depraved city in Texas. Lucky Luke makes a short visit to town to put Fenton in jail and chase out the remaining rabble. But soon the Daltons take up the torch and, following Fenton's lead, create Dalton city, exclusively for gangsters. They even capture Lucky Luke and force him to lend a hand...