Sometime in an apocalyptic future, Daisy, a maladjusted young American teenager is sent to the English countryside for the summer to stay with her Aunt Penn and her three children: Eddie, Isaac and Piper. Daisy arrives at Heathrow Airport to tightened security and reports of a bombing in Paris and is greeted by Isaac who drives her to their farm. Initially abrasive Daisy warms up to her cousins and their neighbour's son, Joe. Daisy also learns from her aunt that her late mother also used to stay at the farm frequently. Meanwhile, Daisy falls in love with her eldest cousin, Eddie. A few days after her arrival, Penn flies to Geneva to attend an emergency conference because she is an expert in terrorist extremist groups.