Set several years the future, after a war between Germany and Great Britain in which the Germans won, "When William Came" chronicles life in London under German occupation and the changes that come with a foreign army's invasion and triumph. The "William" is actually Kaiser Wilhelm II of the House of Hohenzollern.

Hector Hugh Munro (1870-1916), better known by the pen name Saki, was a British writer whose witty, mischievous and sometimes macabre stories satirize Edwardian society and culture. He is considered a master of the short story, and often compared to O. Henry and Dorothy Parker.