New and still sealed! Stars Errol Flynn, Viveca Lindfors with great character actors like Raymond Burr and Una O'Connor. . Becoming caught up in court intrigue, Don Juan uncovers a plot by the King's minister, the ruthless Duke de Lorca, to become the power behind the throne. After de Lorca is exposed by Don Juan, he brazenly intimidates the cowardly king into compliance and threatens to execute the uncooperative queen.