Summer 1966. It's time to enjoy the summer holiday, total freedom. Teenage Élise discovers that the sudden departure of her mother completely disrupts the family. Her brother Coco seeks solace in the garage, building a super racing car. Her youngest brother Benoît throws himself into his own inner world. The father seems absolutely knocked out by the situation. Élise decides to take control of her family, in an eloquent attempt to save them. With the assistance of flourishing nature around her, she stands on the threshold of an incomparable summer.