A young couple discovers a mysterious staircase in an old mansion, unaware that it leads to a dark past filled with tragedy and ghosts....

In a remote mountain range, a climber unearths a chilling family secret that intertwines with the enigmatic fog that shrouds the peaks. As she battles her own demons and the elements, she discovers that the mountain holds a dark secret of its own....

When a group of climbers reaches the summit of a treacherous mountain, they discover that the peak is haunted by an ancient entity, and their descent becomes a nightmarish descent into the unknown....