Soon after 15-year-old Daisy arrives at her relatives' remote farm in England, her aunt goes away on business. The next day bombs go off as London is attacked by an unnamed enemy. Despite the war, it's a kind of Eden at the farm, with no adults and no rules. But the war is everywhere, and Daisy and her four cousins must lead each other into a world that is unknown in the scariest, most elemental way.