The fresh Luise and the polite Lotte meet in a holiday home in the Alps. They soon discover they're not as strange as they thought. They turn out to be twins, separated by their parents' divorce. Luise has a strong desire to get to know her mother, while Lotte longs to connect with her father. So they decide to swap roles. Luise goes to Munich as Lotte, and Lotte goes to Vienna as Luise.