I had a theory that HHhH stood for Hitler, Himmler, Heydrich, but I wasn’t sure who or what the other H stood for. I wasn’t sure why three of the H were capitalised and one wasn’t. I was wrong in the right way. Hitler, Fuhrer, number one in the Reich, Himmler perhaps with the largest powerbase and his number two, but it was Herr Reinhard Heydrich who was ‘killer bureaucrat’ and gloried in being known as ‘the most dangerous man in the Reich’ who...