Paul and Miriam live in a beautiful house on rue d'Hauteville, in the tenth arrondissement of Paris. They have two wonderful children - Mila and Adam. The happy family does not know financial difficulties, but Miriam, a lawyer by profession, feels that she really lacks work: the domestic routine drags the woman into dissatisfaction with herself. The couple are looking for a nanny for their babies. And, after several unsuccessful attempts, finds the perfect Louise, who seems to perfectly advise Mila and Adam. Louise becomes part of their family, she fell in love with these children, sometimes it seems to her that this is her life, and she is afraid of losing him... One day, Miriam, returning from work, finds a terrible picture at home: her children are dead...