the film be partly a thriller and partly a public service announcement when see the event through the perspective of politician and terrorist and of course victim . in this smart drama lesson be give about contamination and survive chaos while meantime the backstage look at the way crisis be manage prompt viewer to distrust guardian and to be scar by assailant . the film and originally air on bbc and get to arouse effectively doubt on official prepareparedness . performance be proper and understated though never terrific . the flick be just a beginning and a provocative start lead to a large discussion but it get to work in my opinion and give the right thrill and cause the audience to reason and to ask itself question .