Upper class Mrs. Barrington (Jeanne de Casalis) takes in two child evacuees from London, including cocky teenager Ronald (George Cole (actor)), lodging them in a cottage she owns. However, it has already been Renting to annoyingly inquisitive Charles Dimble (Alastair Sim). To compound the confusion, Mrs. Barrington had also agreed to allow it to be converted into a military hospital. Supermarine Spitfire pilot Flight Lieutenant Perry (John Mills) parachutes into the nearby loch and becomes the first patient, tended by Mrs. Barrington's pretty daughter Helen (Carla Lehmann). Mrs. Barrington moves Ronald to the main house, while Dimble and Perry remain in the cottage.