Gilbert Keith Chesterton 
The Man Who Knew Too Much [EPUB ebook] 

Everyone who was not born a duke and who has not achieved a premiership will congratulate himself after reading these detective stories of crimes among the upper classes. The criminal hunter in the case never brings the criminals to justice though he captures every one. Yet his work is invaluable. His chief case is concerned with the murder of a powerful nobleman, and its solution involves a Premier who had to choose between murder and plunging his country into war. Then there was the army general jealous of the young captain who was paying attention to said general’s wife—and all sorts of other cases equally thrilling.