Romney Marsh, July 1940. When invasion threatens, you have to grow up quickly. Sixteen-year-old Peggy has been putting on a brave face since the fall of France, but now the enemy is overhead, and the rules are changing. Staying on the right side of the law proves harder than she expects when a plane crash-lands in the Marsh: it's Peggy who finds its broken pilot; a young Polish man, Henryk. Peggy secretly cares for Henryk while he hides in a remote church. As something more blossoms between the two, and other secrets come to light, Peggy and Henryk are forced to question the loyalties and beliefs they thought they held dear.