Ana and her son Mateo live in a middle class apartment in Mexico City. The family routine takes a turn when Juan arrives to visit them after several years of absence. The reunion unleashes memories and secrets of their past that Ana will have to confront in order to find, at last, the peace of mind that has been lacking for so long.
Une fête d'anniversaire tourne à la tragédie et divise une communauté jusqu'alors très soudée, déchirant les familles, détruisant les amitiés et ravageant les cœurs.