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Peter, medical student and son of old materials dealer Richard Müller, wants to get engaged to the daughter of the director of a local construction company. The profession of his father has so far only vaguely hinted out of shame. And so his future in-laws think Richard is working in ministry. When he learns about it, he is initially offended. After all, he lives his profession with body and soul. But then Richard takes advantage of the misunderstanding and pays the bride parents a visit.