While in the basement of Uncle Scrooge's mansion, Huey, Dewey and Louie discover an old piece of paper. When they show it to Uncle Scrooge, he recognizes it as part of his great, great Uncle Fergus McDuck's legendary treasure map! With the remaining parts of the map hidden around the world, it's up to Uncle Scrooge to find them and discover Fergus McDuck's secret treasure!