This novel, written in 1906, imagines a German invasion of England. The story unfolds through a fictionalized military history, incorporating excerpts from journals, letters, and descriptions of the German campaign. It highlights the British struggle to defend against the German advance, which ultimately leads to the occupation of half of London. The narrative portrays the resilience of the British people as they organize resistance movements despite severe German reprisals and limited resources. The climax involves a British counter-offensive to liberate London, leaving the war in a stalemate as German forces occupy Belgium and the Netherlands. The book was a sensation in its time, reflecting the anxieties and fears of a pre-World War I era.