Depuis une sérieuse dispute avec son frère Fred, qui lui servait de modèle, Viviane, photographe professionnelle, a mis en veilleuse ses ambitions artistiques. Or, le hasard lui fait rencontrer Guillaume, un jeune mécanicien dont la photogénie naturelle l'inspire. Réticent, ce dernier se laisse convaincre de poser pour Viviane qui, retrouvant son énergie créatrice, fait de lui le sujet d'un projet d'exposition. Bientôt, l'artiste constate que le jeune homme, qui vit toujours chez ses parents, porte les stigmates d'un douloureuse expérience familiale, qui le rend asocial et autodestructeur. Tout en cherchant à percer le mystère de Guillaume, Viviane tente un rapprochement avec son frère.
Long-time friends Yan, Simon, Roxanne, Maxime and his sister Lily are in their early 20s, the age when anything is possible. They are just embarking on their careers. Then one fine summer day, Yan is involved in a fatal car accident. The young man is killed instantly and the rest of the gang is thrown into turmoil.
Suzie and Samuel have known each other since childhood. With their friend Judith, they form a friendly trio. Now in their mid-twenties, at the age when everything is possible but nothing is easy, they find themselves at a crossroads.
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?
