Marguerite St. Just is a fictional character from the novel "The Scarlet Pimpernel," written by Baroness Orczy. She is the beautiful and intelligent wife of Sir Percy Blakeney, the story's hero. Marguerite is originally from France and becomes embroiled in the political turmoil of the French Revolution. Her character is known for her loyalty and bravery, as she navigates the dangers of the time. In the novel, Marguerite initially struggles with her husband's secret identity as the Scarlet Pimpernel, a daring rescuer of aristocrats from the guillotine. As the story unfolds, she discovers his true nature and becomes an integral part of his mission. Marguerite's journey highlights themes of love, sacrifice, and redemption.