Thayer, James Stewart. S-Day: A Memoir of the Invasion of England
Divergence: 1941 CE
What if: Nazi Germany did not invade Russia, but geared up for an invasion of Britain on May 28, 1942.
Summary: The American Expeditionary Force takes the brunt of the invasion and its commander violates the articles of war in order to save London.
Published: St. Martin's 1990 (0312041489BUY).