Wild Bill and his packer, Evan James, were hand-picked to carry a special cargo over the Rocky Mountains to Yellowstone National Park in August of 1883. This is not only their first trip to Yellowstone, but also the first time a president of the United States has visited the first national park. Rumors of a treacherous journey and a park on the verge of collapse abound. Everyone involved in this mule pack train adventure is a bit nervous about the outcome.