Filippo Derblay, a young man of humble birth, became, thanks to his job, the owner of the ironworks. He is secretly in love with Clara, the daughter of the Marquis of Beaulieu, who lost all his fortune. Clara is engaged to the Duke of Bligny, a vain cousin of her. After learning of Clara’s financial disgrace, the Duke prefers to engage to Atenaide Moulinet, a social climber and daughter of the industrialist Moulinet, the “King of Cacao”. To get revenge, Clara agrees to marry Filippo Derblay, des...