chunk: The "William" of the book's title is Kaiser Wilhelm II, who came from the House of Hohenzollern, hence the subtitle. The book chronicles life in London under German occupation and the changes that come with a foreign army's invasion and triumph. Like Robert Erskine Childers's novel The Riddle of the Sands (1903), it predicts the Great War (in which Saki would be killed) and is an example of invasion literature, a literary genre which flourished at the beginning of the 20th century as tensions between the European great powers increased.