What if the Dupont de Ligonnès case could be reopened-thanks to Gilles Galloux? In 2011, Galloux was a cybercrime investigator with France's Criminal Investigation Department, tasked with tracking the digital trail of Xavier Dupont de Ligonnès. Ten years later, he returns to the case that changed his life forever. For the past two years, Galloux has followed leads long abandoned, tracked down forgotten witnesses, and uncovered evidence never disclosed to the public. He reveals precise movements in the city of Saint-Nazaire, critical blind spots in the days leading up to the murders, and data points that had never been linked before. Through painstaking investigations in southern France and the Nantes region, he reconstructs a methodical plan and traces the route taken by the fugitive after his disappearance on April 15, 2011. This gripping investigation offers a fresh, structured look at a case that has become a national obsession. A deeply personal and revelatory account of one of the most haunting true-crime cases of the past fifteen years.