The final film in François Truffaut's autobiographical ' Antoine Doinel' series, which follows the director's screen alter ego from adolescence (in ' Les Quatre Cents Coups') to the complications of married life here. Separated from his wife, novelist Antoine is having an affair with Sabine (Dorothee). When seeing off his son at a train station, he spots his first love, Colette (Marie-France Pisier), & jumps into her carriage. Colette is now seeing Sabine's brother, Xavier (Daniel Mesguich), & soon all four protagonists are back in Paris attempting to reconcile their lives.