Six months have passed since The Returned disappeared into the mountains, taking Victor, Simon, Camille and her mother Julie with them. Since then there has been no sign of them.
Adele is about to give birth to Simon's baby; part of the town is still flooded; and the military has arrived to keep order.
Just as a mysterious stranger arrives in town, a new wave of resurrections begins.
Toni is kept under observation in hospital, but the police are unaware that he is a Returned. Meanwhile, most of the the Returned are hiding in an area made inaccessible by the flood, along with Julie, Victor, Camille and Claire.
Berg seems to know more than he wants to tell. Is he playing a double game? Who is at risk?
After the inexplicable reappearance of the Revenants, the villagers seek to understand why they have returned. The lake, the dam and the forest house dark mysteries.
In town, Jérome and Berg encounter Audrey, who has escaped from the Domain. Simon warns Adèle to hide their baby from the Revenants. Sensing that Julie is in danger, Victor decides to leave the Domain, accompanied by Madame Costa.
Sandrine hands her daughter Audrey over to Pierre's men, who keep her in their cellar. Hiding in Father Jean-François's church, Adele and Simon begin to come to terms with each other. Julie has found Victor's father, who is now an old man in a coma, and the keeper of a dark secret.
In the Domain, Jérome is finally reunited with his wife Claire and their daughters Camille and Léna. The Revenants, however, will not let them leave. Thanks to Berg's research, the military has managed to lower the water level and plan to re-integrate the Domain with the rest of the town. Unfortunately, this will mean forcing Lucy and the Horde into exile once again. Meanwhile, Sandrine is convinced that Audrey is her daughter.
After the shooting at the gym, the Séguret family tries to leave town, but Camille realizes that she cannot stay with her family and must join the Revenants. The policeman Alcide brings Simon and Adèle's baby to Lucy, but it is too late; the Horde has dispersed and Lucy thinks they will not return.