Auteuil stars as Jean Monier, a well-past his prime defence lawyer who – ever since discovering he was responsible for a killer being exonerated – now prefers to work as a prosecutor. But one evening Jean agrees to help his over-committed wife and fellow counsel Annie by meeting with Nicolas Milik, a shell-shocked father of five who has just been arrested for the murder of his troubled wife. Milik’s predicament inexplicably touches Jean; the more he pieces together the events of the night in question, the more he becomes convinced of Milik’s innocence. Soon Jean rediscovers his passion for his vocation, and becomes obsessed with exposing the killer.