Xavier Dupont de Ligones becomes main suspect after the disappearance of his family back in April 2011. Xavier was a count, and was seen as a perfect father by their closest friends and family members. But one day neighbours realised that the Dupont's windows were shutdown for a week" and Agnes' car was parked on the street. Did Xavier killed his wife and 4 kids? And what is still a mystery... is Xavier still alive? (Sources: netflix, Wikipedia and various online articles)
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