 Lionel (Alex Descas), a widower who drives RER trains in metropolitan Paris, has raised his daughter Josephine (Mati Diop) alone for many years.They have always shared a special bond and live a secure and contented life somewhat isolated from others, in an apartment building in a suburb of Paris.Josephine, an anthropology student, is now grown and become a young woman, but she remains deeply devoted to her father.