A Parisian bus. Its passengers. Evasive glances, polite silence: the well-regulated codes of cohabitation between travelers, confined together for the duration of a journey. Then an incident, a tiny grain of sand, will disrupt this fragile ecosystem. The tension rises and the thin veneer of civility cracks.

A father takes his sons out on an ice fishing trip. The younger one is happy to spend time with his dad, while the older one keeps a deep resentment towards his father, who once abandoned the family. At one point, the trip turns into a challenge in which everyone faces a difficult choice.