In the very old-fashioned town of Ostend suddenly 13 suitcases are delivered to the Grand Hotel, with a note, that O.F. will be here soon and needs 6 rooms. This event, probably the biggest in 300 years, starts a small wave of modernisation, yet everybody is wondering who O.F. is.

A young woman tries to hinder her sister from committing adultery - by wooing the man she thinks is the suitor herself.

The deceased owner of a medieval castle stipulated the following in his will: The heir to his mighty estate would be the elder of the two stepsisters, Katharina and Margrit von Kronberg, namely Margrit, if she married Heinz Wagner, a cousin who had just returned from captivity. When Margrit observed Katharina and Heinz rendezvousing at a nearby lake, Margrit demanded that her husband leave the castle immediately, before she, the elder sister, and Heinz were married. Furious, Katharina then plotted to poison Margrit. Only when Katharina dreamed that the village youth would avenge Margrit's violent death according to ancient tradition and that she, Katharina, would be burned on a pyre like witches in the Middle Ages, did she, after awakening from this nightmare, abandon her bloody plan. Her change of will is rewarded: Heinz has decided to marry Katharina and not Margrit.

The quarrel between the waltz king Joseph Lanner and his still unknown violinist Johann Strauss. It comes to a break. Strauss is engaged in London and has his first successes there. Thanks to the initially unfortunate intervention of Lanner's daughter, a reconciliation is finally achieved.