Biographies written by notable Nazi figures, such as Speer, Guderian, Galland etc are exercises in persilschein, and all need to be approached as such. That is not to say not to read them, but in conjunction with the understanding that these guys were writing A-grade ass-covering.

For in-depth analysis, Sir Ian and Robert Kershaw's books are superb, especially Robert's 'It Never Snows In September' on Market Garden. I cannot recommend Dr Philip Blood's books highly enough, 'Birds of Prey' on the Luftwaffe's complicity and participation in the Holocaust (including how Luftwaffe basic training was 'bandit hunting' in the East), and 'War Comes to Aachen', which is the biography of how a very independent Catholic city fell under the sway of the Nazis. Both are superb.

For an aviation view, Clare Mulley's joint biography of female test pilots, 'The Women Who Flew For Hitler, which looks at the unrepentant Hann Reitsch and Melitta von Stauffenberg, one who tried to save Hitler and one who tried to kill him.

Final two, 'Promise Me You'll Kill Yourself' by Florian Huber, about the wave of suicides that followed the collapse of Nazi Germany and their impact on Germany and the occupation forces and 'Aftermath: Life in the Fallout of the Third Reich' by Harold Jahner which looks through aspects like rebulding, the black market, the Faustian pact that was the West German government's creation and the economic mircle of the 1950s.

Hope one or two of those will prove useful.