Hitler's War

Hitler's War - Harry Turtledove

A credible what if, looking at how the second world war could have started early.  Follows the typical many angled telling that Turtledove commonly uses and does it well as always.
As with the Great War series, Turtledove, only tweaks minor events at the beginning and lets things run in a sort of butterfly effect. The spanish civil war is still happening, the alliances are different but plausible, France invades the Rhineland, the USSR enters the war early, Japan invades the USSR, the Nazis are desperate to keep the USA out of the war. And all it takes is the death of one individual to alter the cause of history...