Daisy (Saoirse Ronan), a teenager from New York, is sent to the English countryside for the summer to stay with cousins. She soon immerses herself in a dreamy reality as she falls madly in love with Eddie, until their perfect summer is blown apart by the sudden outbreak of a 21st Century world war. Separated from Eddie, Daisy is soon forced to fend for herself in a cruel new world. But Eddie is never far from her mind... © 2013 The British Film Institute/Channel Four Television Corporation/HILN Ltd.