thx all, it was (of course) my fault: the newspaper says "Quest Giver", so I double-click it. It opens, but it says "This quest is currently unavailable". I therefore assume that the quest is not available. But you simply have to click the NPC selling the newspapers, then a quest opens where u have to read them (= double click), then another click on the NPC opens the further quest chain.
Again thx all for help, kind regards! Fizzle