In Regency England, a crown, a golden scepter, and a sacred chalice mysteriously disappear from a beautiful princess's castle in Saint-Simeon. Without these legendary treasures, a new prince cannot be inducted, and without a ruler, Saint-Simeon will officially become a part of France. Trailing the treasures to London, the princess enlists the aid of a handsome earl, who is immediately enraptured with her. But unless they uncover the truth behind the theft of Saint-Simeon's royal riches, they may never be able to act upon their mutual affections for each other.