Principality of Monaco, early sixties. Prince Rainier III (Tim Roth) fights to preserve the sovereignty of his country and has little time for his beautiful wife. French President Charles de Gaulle demanded tax levies, threatened France's military superiority and finally ordered a blockade of the country's borders. Monaco is cut off from the outside world. Princess Grace (Nicole Kidman), who has not yet settled into the role of the country's first lady despite her marriage to Rainier for several years and is surrounded by palace intrigue and rejection by public opinion, receives a role offer from Alfred Hitchcock at the same time - a great temptation for the formerly celebrated Hollywood star. As the conflict with France escalates and her marriage enters a serious crisis, Grace is faced with a far-reaching decision: will she choose the longed-for professional challenge and return to the cameras, or will she take on the biggest role of her life yet, that of Princess Grace Patricia of Monaco? The path she takes will profoundly change her, her family and her reputation in the country in a few years.