While taking part in a rodeo in Wisconsin, Lucky Luke and Jolly Jumper meet Mario Bombardier, a Quebecois cowboy, and his mare the beautiful Province. It's love at first sight for the two horses, and after the inevitable separation, Jolly Jumper can't stop moping. Eventually Luke decides to head to Quebec in order to arrange a reunion – and discovers the merry atmosphere of the Nouvelle France: mounted police, bar fights, poutine, traditional French songs ... and an unscrupulous, wealthy banker...