Marie-Antoinette and Louis are about to make their first official visit in Paris. Everything changes when the King falls gravely ill: succession to the throne suddenly becomes a concrete reality. On her side, Du Barry knows she must protect herself from the future Queen of France, or be subject to see her days numbered in Versailles.

Against all expectations, it is Joseph, Marie-Antoinette's brother, who goes to Versailles to save the royal wedding. It doesn't take long for him to realize that he has his work cut out for him if he wants to unite this struggling couple. Time is running out to save the Franco-Austrian alliance.