On a Sunday afternoon, Armin Dobling, floorwalker in a department store run by his friend Theo Kundler, gets a phone call and abruptly leaves his wife Inge to keep a mysterious appointment. Shortly afterwards, a man is seen from a helicopter running after another in a quarry and gunning down his victim. The plate of the yellow car on the spot is photographed by the woman in the helicopter and the number, M-TV 3504, reveals that the owner of the vehicle is none other than Armin Döbling. Has this honest everyman suddenly turned into a ruthless killer? And if so, why? It...

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A dead body is found. The victim's papers reveal his name (Karlheinz Elsmann), his status (he had been unemployed for two years) and his address (he lived in a tower not far away from the crime scene). Surprisingly, a five thousand mark sum is discovered hidden in his belt. Elsmann's wife Marianne, who does not love him anymore, and her lover Manfred Bastian, seem to be the ideal culprits. But what of the five thousand marks?

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