Buck Kildare, searching for a killer, encounters a colony of Basques in the desert and saves them from the henchmen of Hugh Acklin, owner of an adjoining ranch, who wants to take over the immigrants' land. Discovering Acklin's duplicity, Buck soon becomes an ally of the Basques and falls in love with Mercedes, the daughter of their leader. In a showdown between the factions, Buck discovers that Acklin's foreman murdered his brother, Tom. Government forces save the Basques at the last minute, and Buck is happily united with the girl.