Churchill's "The Second World War" does briefly mention the Holocaust in passing, but it is not a central focus of the book. Page 15 for example:

In the Second World War every bond between man and man was to perish. Crimes were committed by the Germans under the Hitlerite domination to which they allowed themselves to be subjected which find no equal in scale and wickedness with any that have darkened the human record. The wholesale massacre by systematised processes of six or seven millions of men, women, and children in the German execution camps exceeds in horror the rough-and-ready butcheries of Genghis Khan, and in scale reduces them to pigmy proportions. Deliberate extermination of whole populations was contemplated and pursued by both Germany and Russia in the Eastern war.

I'm not a statist cock but pretending people didn't die in concentration camps is ridiculous.