A convent girl school's music teacher has composed an operetta. He has to escort his best student to an arranged marriage, but they head for his theater premiere instead.
At the turn of the century a soldier an a convent novice are being forced by their parent to marry each other. Both unaware what the other one looks like meet accidentally the night before their day of betrothal and fall in love, only to discover that they both are promised to what they think is another person.