Stacy De Novo is the owner of a Chicago bakery. He opened this business with his collaborator and dear friend Kevin. Kevin has a daughter named Olivia, from another marriage. A week before Christmas, Stacy discovers that Kevin has entered the pastry at one of the most prestigious industry competitions to be held in Belgravia. Even if he hesitates, Stacy agrees to start with Kevin and Olivia to Belgravia. The last event of the competition will bring Stacy alongside Lady Margaret, duke and future wife of Prince Edward. The Duchess and Stacy remark with surprise that they are identical and, at the request of the future princess, the two of them are changing roles for a few days.