The multi-millionaire Eduard Schlüter takes part under the name Schulze in a raffle of his own Schlüter works and wins a stay at the Grand Hotel. Disguised as a poor swallower, he would like to study the reactions of the hotel staff and guests. As an assistant, he takes his reliable servant Johann with him. Once there, he makes friends and also has cause for annoyance when his daughter and the housekeeper arrive.

The third form of a boarding school and the students of a neighboring school do not get along. Each side dreams up the craziest pranks to defeat the other. And when one day the high school students go as far as stealing the Gymnasium students’ essays and even burning them, daily school life really gets out of hand.

Two nine-year-old girls—rude Luise Palfy and respectful shy Lotte Körner—meet on a summer camp. Apart from their different hair-do, they look alike. They have never seen each other before, but soon find out that they are identical twins. It turns out that their parents divorced, each keeping one of the girls. They decide to trade places at the end of the summer. Lottie curls her hair, Lisa braids hers, and both go off to where they have never been before. The adventure begins.