Daisy, a neurotic and anorexic American teenager, is sent to the English countryside for the summer to stay with her Aunt Penn and her cousins, Eddie, Isaac, and Piper. She arrives at Heathrow Airport to tightened security and reports of a bombing in Paris, and Isaac drives to her cousins' farm, which she discovers to be dilapidated and very messy. Although initially abrasive, Daisy warms to them upon learning that her deceased mother used to stay there frequently. She also falls in love with Eddie, her eldest cousin, finding him to be as introverted and strong-willed as she, and noticing his unusual, almost mystical connection to animals. A few days after her arrival, her aunt flies to Geneva to attend an emergency conference because she is an expert in terrorist extremist groups, and the group takes advantage of her absence to explore their local woodlands.