Born and raised in Belgium, Morris moved to the United States in 1946 for six years. There, he worked for MAD magazine and met René Goscinny, with whom he collaborated from 1955 until Goscinny's death in 1977. JeanLéturgie co-created the character of Percevan before he began an enduring cooperation with Xavier Fauche that produced eight Lucky Luke titles, followed by the spin-off series Rantanplan (Rin Tin Can) and Kid Lucky. Fauche, a well-known figure in French radio, also wrote for the French version of Jim Henson's show Fraggle Rock and co-created the cartoon Les Tifous. Claude Guylouis is the pseudonym for the team made of Patrick Cauvin, Jean-Louis Robert and Guy Vidal, all renowned writers.

Lucky Luke is contacted by a rich individual with an unusual request: he wants to hire the Lonesome Cowboy to escort his stepdaughter Gisella on a trip across the Wild West. He wants her to see for himself the hard life of settlers and frontiersmen at least once before she settles into a comfortable married life. Luke arranges a few fake, safe incidents to entertain the young woman, but she's no shrinking violet, and tends to charge headlong into trouble...