Nathalie...

Nathalie (Emmanuelle Béart) is a Parisian prostitute who is hired for an unusual and secretive task by a professional, upper middle class wife (Fanny Ardant) who fears her husband (Gérard Depardieu) is unfaithful to her. Nathalie has to seduce the clueless husband and regularly report all details of her relationship with him, including his most intimate sexual preferences in bed. Can Nathalie and her reports to the mistrustful wife be trusted? Is the middle aged husband indeed unfaithful?