The official prequel to the hit television show

France, 1976. Baptiste is an intelligent but somewhat naive detective, sent to work in Clermiers, a town filled with corruption. A girl goes missing, presumed dead after bloody clothes are found close to an illicit party near an abandoned chateau. Baptiste believes he's nailed the culprit, the eccentric Gilles Mailloux. When he appears in court, the public call for the guillotine - and that's the sentence Mailloux gets. But as Mailloux awaits an appeal for clemency, he asks to see Baptiste, who's still haunted by the fact the girl's body remains missing. As the clock ticks towards execution hour, Baptiste begins to realise he may have made a terrible mistake...