The novel is a historical fiction that follows the life of Désirée Clary, a young silk merchant's daughter from Marseille, who becomes romantically involved with a young Napoleon Bonaparte before he rises to power. After their relationship ends, Désirée finds herself navigating the complexities of French society during a turbulent period, eventually marrying Jean-Baptiste Bernadotte, who later becomes King Charles XIV John of Sweden. The story, told through a series of fictionalized letters and diary entries, portrays Désirée's transformation from a naive girl into a mature woman and a queen, offering a unique perspective on the political and social upheavals of the Napoleonic era.