On January 24, 2008, Société Générale, one of the largest French banks, caused an earthquake by announcing a loss of 4.9 billion euros, linked to fraud by one of its traders, then unknown. From the initial shock to the media-judicial saga that followed, the series “Kerviel: a trader, 50 billion” retraces in 4 episodes of 45 minutes the key events of this story that has become a symbol of the excesses of finance.