Theodor Fontane

Effi Briest, seventeen, marries the older Baron von Instetten and follows him to a posting in Pomerania. Lonely and frightened, she has a brief affair with Major Crampas. Years later, her husband discovers the letters, challenges Crampas to a duel, kills him, divorces Effi, and separates her from her daughter. Effi dies of illness and grief.