4K UHD - At the height of the First World War, two young British soldiers, Schofield (Captain Fantastic's George MacKay) and Blake (Game of Thrones' Dean-Charles Chapman), are given a seemingly impossible mission. In a race against time, they must cross enemy territory and deliver a message that will stop a deadly attack on hundreds of soldiers - Blake's own brother among them. The cast includes Mark Strong, Andrew Scott, Richard Madden, Claire Duburcq, with Colin Firth and Benedict Cumberbatch.