In 1876, young French socialite Mademoiselle Blanche Monnier was in search of a suitor. She was sought after by many upper-class men for her beauty and kindness, but at the age of 25, she fell in love with an older lawyer. Her mother strongly disapproved of the ‘penniless’ attorney, and in hopes of ending the affair, she committed a heinous crime against her daughter for a quarter of a century.