The Vanishing (2018), directed by Kristoffer Nyholm and starring Gerard Butler, is a slow-burning psychological thriller set on a remote Scottish island. Three lighthouse keepers uncover a mysterious discovery that gradually fractures trust and stability. The film builds tension through isolation, paranoia, and moral collapse rather than overt action.

Från IMDB:
Three lighthouse keepers on the remote Flannan Isles obtain a mysterious trunk, leading to their mysterious disappearance.