I Live in Grosvenor Square

American SSgt John Patterson is billeted in the London home of the Duke of Exmoor. He is befriended by the Duke and British paratrooper Major David Bruce, who has taken leave to contest a parliamentary by-election. Patterson meets the duke's granddaughter, Lady Patricia Fairfax, a corporal in the Women's Auxiliary Air Force, who is David's childhood sweetheart. David is unaware of what is happening until the final night before the election, when it becomes clear to him during a party on the estate.