Jenny McAndrew and her two sons live in the valley known as McAndrew's Pass. When they hear the new Rocky Mountains Railroad Company has plans to lay a line through the valley and their farm, they are devastated that their simple life will be destroyed. Clarence Harper, the ruthless boss of the railroad company, is not a man to brook opposition and will not leave without putting up a fight. In the McAndrews he finds one family that will not be bullied and battered into submission.