Much of the story concerns Prince Rainier's tense political intrigue with Charles de Gaulle and a possible military takeover. Who is the palace traitor? Grace claims her Princess position and authority. That, coupled with her acting skills, help the prince. Kidman has a juicy scene when she smokes out who has betrayed her husband. Princess Grace lets her Philadelphia claws out in that showdown.
Also in the Grace of Monaco cast is the extremely under-utilized and talented Parker Posey as a stern palace assistant who may be out to sabotage the princess. What doesn't Hollywood get about Parker Posey? Did you see her in Party Girl, Waiting for Guffman, Best in Show and A Mighty Wind? Hollywood should've been giving her roles like Teri Garr got for Close Encounters of the Third Kind, Young Frankenstein, The Black Stallion and Tootsie. Madge is not much of a role but Parker Posey does her best.