On a frosty night in 1992, Vinca runs away through a snowstorm with her philosophy teacher, with whom she has a secret relationship. No one will ever see her again. Twenty-five years later, best friends Fanny, Thomas and Maxime, who haven't spoken to each other in all that time, meet at a high school alumni gathering. All three had something to do with Vinca's disappearance in 1992.