In 1943 England, an American Army Air Force gunner falls in love with a corporal in the Women's Auxiliary Air Force who has long been expected to marry a British paratrooper Major, prompting him to go back to combat duty.

This World War II romance, set in Grosvenor Square, a.k.a. Eisenhower's home where the GIs stayed in London. Lady Patricia Fairfax (Anna Neagle) loves Major David Bruce (Sir Rex Harrison). There arrives patriot GI Sergeant John Patterson (Dean Jagger) to rouse things up in the square. Snotty British Lady Patricia and Sergeant Patterson clash and fall for each other. What will Major Bruce have to say or do about this? What will the consequences be? Will the three finally become two and which two in this extremely patriotic love and war story.