The thrilling story of four newly orphaned siblings — Henry, Jessie, Violet and Benny Alden, set in the Depression era. When the children find out they`re bound for separate foster homes, they run away in order to keep their family together. They manage to elude the authorities and eventually stumble upon an abandoned boxcar that they fashion into their new home. Pursued by the authorities and a mysterious stranger, the children discover the rewards and perils of life on the run, as well as the joy of keeping their family together.