In 2002, serial killer Patrice Alègre was sentenced to life imprisonment for five murders. Gendarme Roussel, the main investigator of this case, believes that he will make him confess to other unsolved crimes in Toulouse. Two ex-prostitutes give a series of names of presumed accomplices of the killer, among them Dominique Baudis, then president of the CSA. He decides to face the case alone. Around him, it is silence: not an official support of his political family. Almost twenty years later, we return to the Baudis affair to try to understand it, with the testimonies of Pierre and Benjamin Baudis, his sons, François Hollande, Camille Pascal and the main protagonists.

Alberto Angela hosts an episode filmed in the Palace of Versailles with a single sequence shot: a unique opportunity to admire works of art, monumental rooms, and discover the secret passages and most inaccessible areas of the structure.