In 1962, Grace (Nicole Kidman) has been married for six years. Her every smile and frown has become a classic image of a 20th century princess, but at this time, she is trying to reconcile her past with the present. She longs to return to the big screen, but she hesitates because she now has three jobs - mother of two children, princess of a European principality, and wife of Rainier III (Tim Roth). Hitchcock (Roger Ashton-Griffiths) suggests that she return to Hollywood, which makes Grace distressed. At that time, her husband Rainier's modernization reform measures were resisted by French President Charles de Gaulle, who wanted to impose heavy taxes on Monaco and promoted the use of force to ensure the implementation of this measure. The gradually expanding international crisis and the imminent invasion of France are not only a crisis for Grace's family, marriage, and country, but also a crisis for her personal life. This is a moment when a screen star far away from her hometown in the United States has to make a difficult decision: go back to being the big star that is watched by the world and loved by thousands of fans, or embrace her new identity and her responsibilities to her husband, children, and the second smallest home in the world, her kingdom...