The film begins in Paris with Jacques, an unidentified young man, trying to hitchhike a ride. He travels to the countryside with a family and spends the day walking alone. He whistles and rolls somersaults. The scene cuts back to traffic at night in the city, and the opening credits appear. The next scene is of Marthe, standing at a bridge, at the brink of suicide. Jacques is walking by and stops her. He urges her back onto the street, indicating a police car stopped nearby. They sit by the bridge and chat about their lives. The scene cuts to flashbacks.