Moka (2016)

Consumed with endless grief and silent rage over the loss of her teenage son, an unfortunate hit-and-run victim, grieving Diane Kramer summons the courage to take matters into her own hands. As a result, Diane embarks on a challenging mission for answers in Lake Geneva and the spa town of Évian. Armed with a pistol and a graphic but incomplete description of the offending car, the tragic mother soon suspects there's more to this case than meets the eye. The pain is insufferable, and the deed irremediable. But Diane's serpentine path to justice is treacherous. After all, will it make a difference if Diane finds the culprit behind the wheel?