n 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.

Overview from themoviedb.org