Psychological horror in which two British army men find themselves in a living nightmare. Royal Marine A.J. Budd (Joseph Morgan) is held captive in a house where every day he must fight for his life against gruesome enemies. He uses the journals of a previous prisoner, Lieutenant Edward Sterling (Matt Ryan), who served during the First World War, to aid his survival. The film follows the experiences of both men in the house as they struggle to stay alive and keep their sanity. Will either of them survive the ordeal?