A mind-bending thriller where grief, paranoia, and parallel worlds collide. After the death of their son in a car accident, Ana and Pablo decide to move to the mountain to open a country guesthouse. Their best friends have come over from the city for the opening dinner, but something goes wrong. Strange Northern Lights leaves them isolated, while one of their friends, Guille, suffers a kind of attack and tells an alternative version of their lives. They will take Guille for crazy at first, but little by little, they will begin to consider if what he says can be real.