With its posh clientele gone to the country, Lady Georgiana's fledgling housecleaning business has fizzled. When her friend's suggestion that she hire herself out as a dinner-and-theatre companion ends in disaster, the penniless heiress is shipped home to Castle Rannoch. There she will honor her promise to Her Majesty to keep their American houseguest Mrs. Simpson from seducing the Prince of Wales and help Scotland Yard with a top secret mission.