In the year 1849, Ruth Maramin and her three daughters join a wagon company and begin a journey over the Oregon Trail. Seeking to find “a song” in the west, she and a group of women in the company cling to each other as they face the ordeals, trials and losses of the trek. At each place along the vast western trail she struggles to make sense of an ever more difficult crossing. She becomes close to the wagon master, Josiah Bozeman, who helps her cope as she loses, in different ways, all three of her daughters. In the end she reaches Oregon and finds hope again in a new life. She has found the Pioneer Song.