Cuckoo (2024)

With reluctance, 17-year-old Gretchen departs her American home to join her father, who recently relocated to a resort in the German Alps with his new family. Upon arrival at their new abode, they encounter Mr. König, her father's employer, who exhibits an unusual fascination with Gretchen's silent half-sister Alma. Suspicion arises in this seemingly idyllic vacation spot. Gretchen grapples with eerie sounds and disturbing visions until uncovering a startling revelation that implicates her own family.