Why did the heavens not darken?: The "Final Solution" in history

Demonstrates that while the Nazi's antisemitism was always virulent, it did not become genocidal until well into World War II. One of Mayer's theses is that the crucial decisions about the Final Solution were made only after the Nazis became frustrated with the floundering of the Russian campaign in the winter of 1941-42, and then out of a sense of revenge.