Marie Gessler, known as Marie Chaumontel, Jeanne d'Avrechy, the Countess d'Aurillac, was German. Her father, who served through the Franco-Prussian War, was a German spy. It was from her mother she learned to speak French sufficiently well to satisfy even an Academician and, among Parisians, to pass as one. Both her parents were dead. Before they departed, knowing they could leave their daughter nothing save their debts, they had had her trained as...