An American professional gambler named Jack Weil (Redford) decides to visit Havana, Cuba to gamble. On the boat to Havana, he meets Roberta Duran (Olin), the wife of a revolutionary, Arturo (Julia). Shortly after their arrival, Arturo is taken away by the secret police, and Roberta is captured and tortured. Jack frees her, but she continues to support the revolution.