Bavaria, 1433. Reason of state rules that Prince Albert is to marry Princess Bertha of Wurtemberg. But the fine-looking young man is loath to become the husband of a woman with pimples,flat feet and no breast. Nevertheless, he has to obey his authoritarian father, Duke Ernest, and accompanied by faithful Count Törring, he mounts his steed and sets out for Würtemberg. Stopping in Augsburg, he falls in love with the daughter of a local barber-surgeon, pure and beautiful Agnès Bernauer. The couple is soon secretly married and both take refuge at the castle of Margravine Josepha, Albert's aunt, waiting for Ernest's consent. Unluckily Albert's father will not accept his son's union with a commoner and Albert, supported by Josepha and an army of common people, declares war on the Duke. They seem about to be victorious when Brother Enrique, a monk formerly in the Holy Inquisition, finds a way to reverse the situation: accusing Agnès of witchcraft...