After the summer holidays, a lot has changed at the girls' boarding school Lindenhof. The school director has to go on a trip and there is a rumour that there is a real princess among the new ones.

Summer break is over and the twins return to Lindenhof, which has changed very much because Mademoiselle Bertoux has taken over while Mrs. Theobald is traveling.

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Hanni and Nanni are not only sisters, but also best friends. The twins are inseparable and always up to something. When they cause a wild chase through a department store, their wealthy parents have ...