An old case is wrenched open when a reporter goes missing, leading his web sleuth daughter to a small mountain town haunted by a sect, secrecy and death.
Cast:Hatik , Noémie Schmidt , Camille Lou , Nicolas Godart , Raphaël Ferret , Kad Merad , Jean-Marc Barr , Stefano Cassetti , Etienne Diallo , Jaa Smith-Johnson , Marianne Basler , Florence Muller , Romane de Stabenrath , Léo Legrand , Vincent Rottiers , Anaïs Parello , Isabelle Candelier , Bernard Blancan
Convinced that her missing dad is in danger, Ida follows his trail to a town in the French Alps. A second disappearance brings an old case to light.
As Ida and Jaro look to old VHS tapes for clues, a suspicious Giovanna visits the Arcacia lab. Trouble brews ahead of the annual festival of Lévionna.
Gio and Ida find common ground as they explore hidden mountain terrain. Jaro and Roméo seek out a recluse who may know the truth about Roxane Vial.
Gio's theories create cracks in her marriage. Ida tries to make sense of DNA tests as Jaro and Roméo visit a psychiatric hospital in a state of chaos.
Ida is able to stop the assault on her father, but the experience makes her flee. Meanwhile, a series of flashbacks clarify the relationships among the protagonists and in particular the relationship between Romeo and Hari.
As terror ensues inside the mine, a riot breaks out at the Arcacia lab. Gio desperately attempts to locate the group in the tunnel before it's too late.