Waldo Badminton, one of Lucky Luke’s clients, is looking for his butler Jasper, who went missing in Klondike. The gold rush has made people from all over rushing in to find riches there. It's not an easy feat to find Dawson, the town founded by Klondike prospectors where Jasper was last seen, and Jolly Jumper would be the first horse to reach this remote town. Will Waldo Badminton and Lucky Luke find Jasper there?