- 2d 5h 16m
I wonder if there's an alt-hist book out there that uses a "Germany invades East in 1939 first, then turn to West Europe in '42" scenario. It's kinda hard, because moving against Poland or Czechoslovakia (as they did) would start the western war anyway... But if you can manage the Munich accords better... imagine that Germany has full freedom to invade USSR without looking over its shoulder... then can turn against the rest of Europe after they secure the russian resources.
However, a slightly more likely scenario would have seen the French ditching Britain for an overture to Germany. There were very complex sentiments towards Germany in France prior to WWII, as well as many of the French elites who detested the UK. While I wouldn't say there ever was a good chance at this happening, it did reach the level of open discussion a few times in French papers and think tanks of the time.