Cuckoo is filmmaker Tilman Singer’s second feature, but you can’t tell by looking at it. Set in the German Alps and shot on 35mm, the movie has a dreamy quality to it, almost fairytale-esque in its story about American teenager Gretchen, who moves with her father’s family to a secluded resort in the off-season. This resort is home to more than just tourists, though, and as Gretchen becomes increasingly paranoid after experiencing several run-ins with a strange, humanoid creature, things naturally go haywire.

https://screenrant.com/cuckoo-movie-tilman-singer-interview/