Myriam and Paul, are your typical pair of bourgeois Parisian parents of two young children, toddler Adam, and five-year-old Mila, who is taking up all of Myriam's time. When Myriam decides to go back to work despite her husband's initial reluctance, 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.