In the smart Parisian suburb of Maisons-Larue, in the wake of the Paris 2015 terrorist attacks, an au pair is arrested after the sudden and suspicious death of her 9-year-old charge. The truth behind what happened is unravelled through six women: Geraldine, a heartbroken French teacher who struggles to connect with her vulnerable students; Lou, an incompetent au pair fired by the family next door; Charlotte, a chilly socialite and reluctant mother; Holly, an anxious au pair who yearns to feel at home in Paris; Nathalie, an isolated French teenager desperate for her mother's attention; and finally, Alena, the au pair accused of killing a child. All of them play a part in 9-year-old Julien's death.