Retreat

Retreat is a 2011 British psychological thriller film and the directorial debut of former film editor Carl Tibbets. The film stars Cillian Murphy, Jamie Bell, and Thandiwe Newton as three people isolated from the rest of the world on a remote island. Two of them are told they are survivors of a fatal airborne disease that is sweeping over the entire world. However, their induced isolation may be the result of a lie, and it may be that they are being held at the whim of a madman.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.