Pierre Lachenay es un conocido editor y profesor, casado con Franca y padre de Sabine. Pero al conocer a la azafata de vuelo Nicole, inician una historia de amor. Y por mucho que intenta ocultar esta aventura a su esposa, lo cierto es que Pierre no puede soportar mantenerse alejado de Nicole…

Before starting one of his most personal works, Truffaut wrote to his close friend Helen Scott, “The film will be indecent, completely shameless, quite sad; but very simple.” Shot very quickly in Truffaut’s own apartment in melancholic monochrome, the film deals with the throes of passionate love.