In 1994, two brothers are enjoying the summer that will change everything: the youngest, Lucas, is starting school and will have to accept that his older brother, Bruno, who has Down syndrome, will not take part on this new adventure.

Tristan and Agnes arrive at a rural house with an enigmatic purpose. Away from their everyday lives, they enter into intimate conversations and reflections, hiding their own secrets. As dusk gives way to darkness, it seems that their hidden goals might take shape, changing the dynamic and bringing to the surface mysteries that could affect their relationship.