An American teenager (Saoirse Ronan) is sent to rural England to spend the summer with step-cousins. Just as her aloof attitude changes and she begins to love the experience (and the oldest boy), a terrorist takeover rocks the couintry. What starts as a transplanted teen drama takes a forceful shift into a tense fight for survival. The young cast creates characters that are appealing and director Kevin Macdonald (Last King of Scotland) has crafted a surprisingly affecting and sometimes frightening film.