In 2011, the Dupont de Ligonnès family mysteriously disappeared in Nantes, France, sparking a nationwide search. Their bodies, including their pets, were later found buried at their home, with evidence pointing to the father, Xavier, as the perpetrator. Financial troubles and meticulous planning suggested a motive, but Xavier vanished, evading capture despite a massive manhunt. In 2019, a mistaken arrest reignited media attention, but the case remains unsolved, leaving the motive and Xavier's whereabouts a haunting mystery.