Only reluctantly does 17-year-old Gretchen leave her American homeland to live with her father, who is currently moving into a resort in the German Alps with his new family. Arriving at their future home, they are greeted by Mr. König, their father's boss, who has an inexplicable interest in Gretchen's mute half-sister Alma. In general, something seems to be wrong in the tranquil holiday paradise. Gretchen is plagued by strange noises and disturbing visions until she comes across a shocking secret that also affects her own family.