In Montana on business, The Virginian and Trampas stay at the inn run by Louis Boissevain (Ricardo Montalban), an exiled Canadian revolutionist, and his wife, Suzanne Mayo (Lois Nettleton) whom Trampas recognizes as a former love interest. The Shiloh duo find that some of Louis' former confreres want him to return to Canada to lead another revolution, but that there are traitors in the group who plan to hand Louis over to the Canadian government for execution.