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Karl Wieser, the Zurich tram driver, is a henpecked husband. When he is chosen to give a demonstration ride to foreign experts, he gains favor with his wife Anni. The mother is also particularly proud of Helen, her older daughter in America, who has made a good match, her younger sister Inge, who is destined to become a world-famous singer, and her son Herbert, who is studying medicine. But it turns out that she is succumbing to her own delusions and deceit.