The story is complex and is told in 12 chapters. The basic plot involves a corrupt banker named Favraux, who is the target of Judex's revenge. It is eventually revealed that Judex's real identity is Jacques de Trémeuse, a man trying to avenge his family ruined by Favraux. Complicating matters is Favraux's beautiful and innocent daughter Jacqueline, with whom the avenger has fallen in love. A final element comes in the form of Diana Monti and her criminal gang who are working at cross purposes with Judex.