Myriam (Leïla Bekhti) and Paul (Antoine Reinartz), are a typical pair of Parisian bobos and parents of two young children, toddler Adam, and 5-year-old Mila. When Myriam decides to go back to work despite her husband’s initial reluctancy, the couple starts looking for a nanny. After a very selective process, they finally find the perfect candidate, Louise, a poised 40-year old woman who is an instant hit with both kids and parents. But appearances can be deceiving, even dangerous.

Adapted from the eponymous novel by Leïla Slimani, winner of the Goncourt prize, and based on a true story, the film offers a true pedestal to Karin Viard who seizes with formidable mastery this role of a disturbed nanny whose mask of perfection gradually cracks.