A father-daughter relationship is melded, strained, and deepened by a shared angst: the grandmother in the family left her home by train and never arrived at her destination. The father Pierre (Jean Rochefort) is distraught that the police could basically dismiss the issue as inexplicable, and he decides to retrace on foot the voyage his mother should have made. His daughter Amelie (Camille de Casablanca) goes with him, and the story evolves as the two walk along the train tracks, searching in the nearby terrain and bushes for any evidence that might point to what happened. Along the way, their once antagonistic and distanced relationship (Amelie is a student, her father is a picture-restorer) begins to work itself out...