Marion Gruber runs a costume hire agency and in the evenings lives out her personal fantasy that she is Sisi, Empress Elisabeth of Austria. As the harmless dream grows into a dangerous obsession, Marion becomes unpredictable and violent. A coachman whom she has hired for a midnight drive around Vienna is stabbed when he becomes too curious. When her business manager finds her Sisi memorabilia and becomes suspicious, he threatens to go to the police unless she signs the business over to him. Fortunately Inspector Alex Brandtner has pieced it all together and arrives on the scene before more harm is done.
—Anonymous