When friends gather at a remote chalet in the French Alps for a summer getaway, they become caught in a deadly trap when a dark secret from the past comes to light. Following a series of accidents, the group becomes paranoid upon realizing that they must be related. Thierry sets out on foot to find help. Grisly discoveries lead the friends to distrust one another. Manu reveals news that pushes the survivors to their breaking point. Flashbacks throughout the series show what happened when the family disappeared from the chalet 20 years earlier.