World War II pilot Peter Marshall leads the most successful bombing crew at his airbase, having survived an unusual number of extremely dangerous missions over Germany. However, when Peter falls hopelessly in love with an attractive WAAF officer - one who insists that wartime duties should take precedence over emotions - his concentration begins to suffer. Soon it looks as though his perfect run of successful missions may be at risk - along with the lives of Peter and his men - unless she can be persuaded to relent.