Radha, une jeune femme indienne installée à Paris, vit avec son mari, Pierre, et leurs deux filles. Elle s'est enfin découvert une vraie passion : le parfum et ses trésors. Sa tâche, aussi palpitante qu'ardue, consiste à aider une illustre parfumeuse à concevoir de nouvelles fragrances. Quand on lui confie une mission d'ampleur pour la première fois, Radha retourne en Inde, où elle demande l'aide de sa soeur, Lakshmi, et des courtisanes d'Agra, des femmes qui utilisent les pouvoirs du parfum pour séduire leur monde. Elle est sur le point de faire une découverte capitale quand un secret de famille longtemps enfoui refait surface, menaçant de bouleverser sa vie si soigneusement orchestrée.

Paris, 1974. Radha is now living in Paris with her husband, Pierre, and their two daughters. She still grieves for the baby boy she gave up years ago, when she was only a child herself, but she loves being a mother to her daughters, and she's finally found her passion--the treasure trove of scents. She has an exciting and challenging position working for a master perfumer, helping to design completely new fragrances for clients and building her career one scent at a time. She only wishes Pierre could understand her need to work. She feels his frustration, but she can't give up this thing that drives her. Tasked with her first major project, Radha travels to India, where she enlists the help of her sister, Lakshmi, and the courtesans of Agra--women who use the power of fragrance to seduce, tease and entice. She's on the cusp of a breakthrough when she finds out the son she never told her husband about is heading to Paris to find her--upending her carefully managed world and threatening to destroy a vulnerable marriage.