“The Perfect Nazi” could be described as the darker side of tracing one’s family tree. Imagine discovering that a close blood relative, your grandfather to be exact, was a high ranking member of the SS? For Martin Davidson, a man who has enjoyed senior positions at the BBC, RDF and again at the BBC in charge of history, the challenge and revelation must have been considerable. For most of his life, Davidson grew up knowing that his grandfather had served in Germany during the Nazi regime. Little was ever spoken to him about his mother’s father, Bruno Langbehn’s involvement with the Nazi party.