In July 1862, the law prohibiting polygamy came into force. This law was aimed in particular at Utah and its Mormon communities. Chesterfield and Blutch were given an unusual mission: they had to go to Bloomington, a small town in Utah, in order to go to parliament with a small Mormon community, try to make them respect the law and convince them to change their way of life. Arriving in Bloomington, they were going to discover on one side the Grumbler family, composed of good-for-nothings, fighters, alcoholics and lazy people who liked to martyr the Mormons and on the other hand, this small, friendly, simple and hard-working Mormon community that was going to completely shake the mind of poor Chesterfield... Between a family of good-for-nothings and a Chesterfield who was losing its feet, Blutch had work on the board!