Expectant couple, Adèle and Manu, arrive at a renovated chalet in the remote village of Valmoline in the French Alps, where family of a failed writer had sought to start their lives afresh 20 years earlier.

Cut off from the world, the wedding party regroups and plans a trek to the nearest mobile tower. Flashbacks reveal a cruel encounter from Alice's past.

Paranoia takes hold as the group realizes the accidents must be related. While the others tend to Laurent, Thierry sets out on foot to find help.

Close calls and the grisly discoveries sow distrust among the friends. Twenty years earlier, the police investigate the Rodiers' sudden disappearance.

Manu returns with new that pushes the survivors to the breaking point. The Rodiers' last night at the chalet plays out from a different angle.

As the final pieces of the Rodiers' story fall into place, Etienne and Seb take a captive, and the killers reveal their endgame.