In a picturesque French alpine town overshadowed by a towering dam, life is irrevocably disrupted when the dead suddenly reappear. Without warning, locals who perished years—sometimes decades—earlier wander back into their former lives. They have not aged a day, retain no memory of their deaths, and possess only fragmented recollections of their pasts.Camille, a teenager killed in a devastating bus crash four years prior, returns to a
fractured family. Her twin sister, Lena, has grown older, scarred, and bitter, while their mother, Claire, struggles between overwhelming joy and terrifying disbelief. Meanwhile, a silent, mysterious young boy known only as "The Kid" is found wandering alone on a highway by a
compassionate nurse, Julie. Despite his muteness, he forms an intense bond with her, though his presence draws sinister, unexplainable forces. At the same time, Simon, a groom who committed suicide on his wedding day years earlier, returns intent on reuniting with his former fiancée, Adèle, who is now engaged to another man.As the days pass, the town experiences bizarre anomalies. The local water level in the nearby reservoir mysteriously drops, power grids fail unpredictably, and the animal population behaves with erratic violence. Fear and paranoia grip the community. Rumors spread, and the living divide into factions: those who desperately want to protect their resurrected loved ones and those who view them as demonic abominations threatening the natural order.As the living and the returned attempt to coexist, dark secrets surface. It becomes clear that the returnees are not completely alive; they suffer from strange physical ailments, and an eerie mass migration begins to take shape. Simon struggles to control his fading grip on reality, while Camille’s family tries desperately to hide her identity from a hostile public.The tension culminates when the returned gather at a secluded venue, seemingly drawn by an unseen, primal force. Led by Victor and the other children, the deceased prepare for a collective departure. When the mysterious horde descends upon the town en masse, the living barricade themselves inside. In the final, haunting sequence, the returned peacefully walk away into the misty mountains, leaving behind a bewildered, devastated populace. The survivors are left facing a terrifying new reality, forever changed by the brief, impossible return of those they once laid to rest.