Dr. Robert Stegemann is a dentist in Munich. He is a long-time widower and loving father of his daughter Biggi. Shortly before Biggi's 21st birthday she falls in love with the manager from the clothing industry Jochen However, she is not able to admit this to her father. The young couple want to get married, but the father has nothing in between. After the early death of his wife and Biggi's mother, he directed his whole life towards the education of the girl. Even her daily life is spent by father and daughter together, because Biggi is his doctor's assistant.