Back in the 1970s, we see a young Louise who is crazy in love with Vincent, a rebellious activist. Along the way, Louise will have to give up some of her political ideals and make some difficult sacrifices. Today, Louise has become a formidable businesswoman at the head of Nocturne, her perfume empire that owes much of its success to her top-selling perfume Nuit Blanche. Everything changes when, at an evening reception celebrating her success, Louise dies alone in her garden. Is it murder or an accident?