Trapped in the woods

Four girls have been friends for years. During the Christmas holidays they rent a cottage in the Ardennes, where they get snowed in. There is no electricity, the mobile network is down and the nearest house is miles away. The girls have a good laugh about their situation until Maud disappears after an argument. And soon after that, Fay is missing too. Concern turns to fear. Does this group of friends really know each other as well as they think?