Having completed their task of keeping the peace in Mulrooney until a permanent marshal can arrive, Dusty and the floating outfit planned to head for home. Unfortunately the hired guns from Cards and Colts come VERY close to killing Dusty and he feels he owes his life to a man who shouted out a timely warning. The man wastes no time in collecting on the debt and drafts Dusty to act as Gang Boss to help build the railroad spur between Mulrooney and Canada. Despite having never had any previous connection with the railroad industry Dusty naturally (being practically perfect in every way) wins the respect of the men and improves upon their system so that lost time is quickly made up. With time hanging heavy on their hands Waco and the others start to ask questions about the beef supplied by the company's 'hunters' and discover that it bears a brand known all too well to Mark Counter. In fact, the course of the railroad is now verging well onto the holdings of Mark's Uncle Front de Boeuf. This has not gone unnoticed by the family and their hands and they are less than cordial in their reception...