Summer 1942. Over German-occupied France, a Royal Air Force bomber becomes lost after a mission and is shot down over Paris by German flak. Three of the crew, Sir Reginald, Peter Cunningham and Alan MacIntosh, parachute out over the city, where they run into and are hidden by a house painter, Augustin Bouvet, a puppet show operator, Juliette, and the grumbling conductor of the Opéra National de Paris, Stanislas Lefort.