Even a hero from the Far West needs a vacation from time to time, and looking after a few Swiss cows seems like the perfect opportunity for Lucky Luke. These milk cows happen to produce the precious substance necessary for the production of authentic Swiss chocolate! The West has just discovered cocoa, and chocolate should soon be a commodity in all mouths. And yet... between vicious autograph hounds, the chief of the Chicoree tribe, and two cowboys whose frustrated love leads to even more frustrating brawling, will Lucky Luke end up yearning for a reunion with the Daltons?