In a small mountain community, two local people - teenager Camille, and Simon - who both died years earlier, suddenly re-appear at their homes. They have not aged, and they are completely unaware of their own deaths.
Camille and Simon assume they can rejoin the world of the living as though nothing has happened, but their return throws their friends and family into a state of turmoil.
Camille's sister Léna has continued to grow up without her sibling beside her, and Simon's wife Adèle is just about to get remarried, to Thomas. Meanwhile, lonely nurse Julie receives a visit from a very strange little boy.
Seven years ago, the town was struck by a series of bloody murders. Now it seems the killings have started up again. In French with English subtitles.
Simon attempts to approach Adele, but Thomas learns about his 'return'.Camille is unable to fit back into her family. Her parents separated after her death, and now Claire is in a relationship with Pierre, an odd but charismatic figure who knew all along that the dead would return.
Camille invents a new identity for herself as 'cousin Alice' in an effort to rebuild her life. Léna discovers a strange, fast-spreading scar on her own body. Simon begins to get closer to Adéle, who finally accepts he has returned. As the dead though attempt to reclaim their lives, for the living, things seem more and more disturbed. Julie's past catches up with her and threatens to destroy her but she finds a saviour in an unlikely form.
Living as Alice is going well for Camille. Lena's scar is growing and seems to be draining her of energy. She believes that Camille is behind it and publicly denounces her to their friends. Julie is no longer able to keep Victor under wraps and the police take him away. Adele gets back with Simon and she introduces him to their daughter, Chloe. She then finds out the true circumstances about his death.
The dead start to come out into the open but find it impossible to resume normal lives. Camille is rejected by Frederic whie Simon ends up being separated from Adele and Chloe after Thomas shoots at him in self-defence. Julie starts to have doubts and wonder if she be dead too. Luna is nursed by the serial hugger as he attemptsto keep his murderous impulses under check.
The town ends up being hit by a power cut. Pierre forms a community around Camille, who is now seen as a 'prophet'. Julie manages to find some refuge at Laure's house with Victor, whose body is undergoing a weird transformation.
Camille finds purpose when she decides to invent images of an afterlife to comfort her friend's parents, but is distraught when they commit suicide in the hopes of meeting their son sooner.
Pierre shows Claire his shelter stocked with food and firearms, believing that the appearance of the Revenants marks the end of days. Lucy appears to have gained understanding regarding the purpose of the Revenants, and persuades Simon that he no longer needs Adèle; father Jean-François' betrayal of him to the police only pushes him further to her.
Serge and Toni attempt to track Lena, and Toni glimpses his deceased mother in the forest. While trying to cross the lake by swimming, Serge disappears under the water.
A flashback to the date of Camille's reappearance at the dam shows many Revenants also appearing at the same time. Waking in their car, Victor tells Julie and Laure that a group of Revenants tried to take him from the car in the middle of the night.
On their way to the shelter, Victor discovers that Toni killed his brother, in turn causing his mother's death, and uses his ability to create visions to make Toni shoot himself in the stomach; he dies shortly after arrival. Simon breaks free from his jail cell and kidnaps his daughter, Chloé. Thomas arrives at the shelter, and the group realise that there are other Revenants, and that they are coming for them.