When Lucky Luke arrives at Cactus Junction, he discovers a picturesque character: Ma Dalton, who is none other than the mother of the Daltons. To honour her name, she simulates attacks at the merchants. These play the game. My Dalton hastened to write to her sons to tell them about his encounter with Lucky Luke. From then on, the Daltons will escape and Cactus Junction as well as the surrounding cities will no longer know the calm of Dantan!