The Paladin (Garfield novel)

Supposedly based on a true story, it is about a young boy "Christopher Creighton" who befriends Winston Churchill in the mid 1930s and then goes on to take an active role in a number of World War II operations including: informing Churchill in advance of the surrender of Belgium leading to the Dunkirk evacuation, stopping the Americans from being warned of the Attack on Pearl Harbor by sinking a submarine, and misleading the Germans about the Normandy invasion.

So, believe it or not, this is a ripping good yarn--with food for all sorts of WW II-history speculation.

"[1] The International Churchill Society wrote "His novel is splendid entertainment for the highly committed Churchillian, and you should definitely add a copy to your library of tall tales.

"[2] The Washington Post, in its review, disproved a major part of the book posited as true, the sinking of a Dutch submarine which had seen the Japanese fleet approaching Pearl Harbor, and concluded "The writing moves along at a lively pace, but the characters are so wooden a Gepetto would drool.

Still, it's a substantial cut above, say, Robert Ludlum, whose own novels are equally improbable, but more clearly designated as pure fiction.