What if the Dupont de Ligonnès case was revived thanks to Gilles Galloux? The investigator from the Criminal Investigation Department’s Central Cybercrime Office, who was in charge of the digital hunt for Xavier Dupont de Ligonnès in 2011, is back ten years later on the case that turned his life upside down. For the past two years, Gilles Galloux has been revisiting neglected leads, tracking down forgotten witnesses and uncovering elements never before revealed to the public. He brings to light precise movements in Saint-Nazaire, decisive grey areas in the days leading up to the tragedy, and data that had never been linked together. Through verifications carried out in the Var and Nantes regions, he has assembled facts that reveal methodical preparation and outline the direction taken by the fugitive after his disappearance on April 15, 2011. This rigorous work offers a structured re-reading of a case that has become a national myth. A personal investigation, unprecedented and indispensable for understanding one of the most striking criminal cases of the last fifteen years.