The Red Danube

In Rome shortly after World War II, British Col. Michael "Hooky" Nicobar (Walter Pidgeon) is expecting a transfer home when he is instead posted to Vienna with his aides Auxiliary Territorial Service#Ranks Audrey Quail (Angela Lansbury), Major John "Twingo" McPhimister (Peter Lawford) and Private David Moonlight (Melville Cooper). Hooky is assigned to assist Brigadier C.M.V. Catlock (Robert Coote) in monitoring possible "subversive activities" against the Allied nations and Repatriation Soviet citizens living in the British zone of Vienna. He and his aides are billeted at a convent, led by the friendly Mother Superior (Ethel Barrymore). At this convent, Twingo is drawn to a ballerina calling herself Maria Buhlen (Janet Leigh). He falls for her instantly and tries to meet her, but she is reluctant to, until they are officially introduced to each other by Mother Superior.