After a high risk secret marriage to Prince Ferdinand of Aragon, Isabella finds there is no easy path to gaining the crown of Castile.  An evil uncle, a civil war, and a heroic Portuguese flag bearer appear in this episode as Isabella fights to be Queen.  An astonishing solution to a domestic quarrel paves the way for female rulers in Spain, and Isabella reveals her courage and determination as she takes on rebellious nobles and a kingdom in desperate need of management.  Along the way the incredible social mixture that makes up the cultural fabric of Spain comes into focus.