In April 2011, a family in Nantes seemed to vanish behind letters about relocation, secrecy, and a new life abroad. Then police found Agnes Dupont de Ligonnes and her four children buried at the family home. Xavier Dupont de Ligonnes, the husband and father, had traveled south through France and disappeared after a final confirmed sighting near Roquebrune-sur-Argens. This episode follows the letters, the house, the southbound trail, the false leads, and the unresolved hunt for one of France's most wanted missing suspects.