Marie Antoinette is just a teenager when she is forced to leave Austria to marry the Dauphin of France. She must deliver an heir in order to secure an alliance between the two nations, but she is unprepared for the royal family that awaits her.

The royal family spends some holidays in Fontainebleau. Marie-Antoinette learns about du Barry's plan, who looks for a fiancée for Provence. Will the second pretender to the throne of France be able to birth the Bourbon heir before Louis and Marie-Antoinette perform their duty?

Louis may now be King, but Marie Antoinette is determined to launch her reign as the Queen of France. However, as her political advice is ignored and Provence and Joséphine threaten to deliver an heir, a chill sets in the royals' marriage.

Louis becomes increasingly confident in his position as King as he throws himself into supporting the American War of Independence. Marie Antoinette spends her time at the Petit Trianon where she begins to fall for a familiar face.