By 1942, it was an article of faith that what the Nazis called ‘The Jewish Question’ had only one answer: the mass extermination of an entire people. Six million European Jews were savagely murdered

In 1926, at the age of twenty, a trainee dentist called Bruno Langbehn joined the Nazi party. Growing up in a Germany that was impoverished and humiliated by the defeat of the First World War, and su