Grace Pellisier, who is an actress, meets a good-looking, absolutely distinguished, and entirely mysterious man at St. Moritz. He introduces himself as Mr. Peter, teaches her to waltz, and bids her goodbye. Everyone calls him the mysterious Mr. Peter. She runs into him at a restaurant while having lunch with her aunt. Miss Pellisier wonders why people bow to him. Who is this mysterious Mr. Peter? Is he the Crown Prince of Bergeland?