When Myriam, a French-Moroccan lawyer, decides to return to work after having children, she and her husband look for the perfect caretaker for their two young children. They never dreamed they would find Louise: a quiet, polite and devoted woman who sings to their children, cleans the family's chic apartment in Paris's upscale tenth arrondissement, stays late without complaint and is able to host enviable birthday parties. The couple and nanny become more dependent on each other. But as jealousy, resentment and suspicions increase, Myriam and Paul's idyllic tableau is shattered...