Fearing her father's disapproval if she moves away from home, Celia hesitates about joining up but eventually her call-up papers arrive. Hoping to join the WAAF or one of the other services, Celia instead gets posted to a factory making aircraft components, where she meets her co-workers, including her Welsh room-mate Gwen Price (Megs Jenkins) and the vain upper middle class Jennifer Knowles (Anne Crawford). Knowles dislikes the work they have to do at the factory, causing friction with their supervisor Charlie Forbes (Eric Portman) which eventually blossoms into a verbally combative romance.