In California, The Southern Pacific Railway was prying the West wide open, and the land was worth its weight in gold. While some men got in on the action, and some got out of the way, one group of settlers was making a stand--and holding up the railway. Turning to Alan Pinkerton's Chicago detective agency, the railroad robber barons hired the perfect agent to penetrate the settler's organization, a man who had learned a spy's trade in the Civil War...