A 17-year-old girl is forced to move with her family to a resort where things are not what they seem.

Reluctantly, 17-year-old Gretchen (Hunter Schafer) leaves her American home to live with her father, who has just moved into a resort in the German Alps with his new family. Arriving at their future residence, they are greeted by Mr. König (Dan Stevens), her father’s boss, who takes an inexplicable interest in Gretchen's mute half-sister Alma. 
 
Something doesn’t seem right in this tranquil vacation paradise. Gretchen is plagued by strange noises and bloody visions until she discovers a shocking secret that also concerns her own family. 
 
Following his festival sensation “Luz”, German director Tilman Singer has once again succeeded in creating an atmospheric and visually outstanding horror trip with an original plot and perfidious twists.