Princess Mary of Burgundy, traveling in disguise using the name of Yolanda, attends a silk fair and falls in love with Maximilian, who has disguised himself as a knight. Later Maximilian is framed and imprisoned by conspirators, but is saved by Mary. She and Maximilian plan to wed, but when the Swiss threaten Mary's father, the duke, with war if the marriage occurs, he arranges a marriage for her with the mentally unstable Dauphin of France. Maximilian determines to rescue her from marriage with the dauphin--even if it means war with the Swiss.