When five members of the cheery, churchgoing Dupont de Ligonnès family were found dead at their home in Nantes – buried in the garden with small Catholic relics – a million questions erupted from neighbours, family and friends.But for the police, only one question mattered: where was the sixth? Xavier Dupont de Ligonnès was nowhere to be found. And as they dug into his past, they uncovered a story that’s obsessed the nation of France for years: one of an ancient aristocratic dynasty, of international espionage, and a crime scene that, decades later, still refuses to add up…See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.