Professor Gustav Heink is a pianist and music teacher who is adored by his students, although he is no longer a young man. For decades, he has been married to Marie, who quietly tolerates his idiosyncrasies. Heink loves to flirt with young women. This gives him the self-affirmation that he is still young, attractive and desired. Between him and his wife, who still loves him dearly, a code has developed for this circumstance. When the master, as his students call him full of admiration, gives a “private concert”, this means nothing other than that Prof. Heink wants to have another affair, an extramarital sweetheart. Marie Heink has come to terms with this fait accompli and suffers quietly. The aging piano virtuoso assumes that his tolerant wife has no objections. Heink's latest conquest is called Delfine Jura and is married to the young scientist Dr. Franz Jura.
A liaison with a married woman? - that has never happened with Heink before, and so the two victims of this affair, Marie Heink and Delfine's husband Franz, decide after he, like her, from Heink's music student Eva Gerndl, who herself has had an eye on the pianist, about the affair were informed to intervene this time. Because of course, instead of touring, it's actually going to the music professor's love nest, a remote, lonely mountain hut run by the loyal Pollinger couple. Franz and Marie have come up with a clever plan: the two unfaithful people are told that they, Franz and Marie, have fallen in love with each other and that this shouldn't be a problem for the spouses, since Heink and Delfine would also be a couple. Suddenly, the pianist and his apprentice are no longer so sure about this and their passion for each other cools down noticeably. Jura and Marie have achieved what they wanted: Delfine returns to her charming husband, and Professor Heink finally understands what he has in his Marie.
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