Forgotten Fatherland, By Ben Macintyre

No, not another new book from the assiduous Macintyre – this Paraguayan yarn appeared in 1993 – but it is a story as odd and involving as Double Cross and Operation Mincemeat.

The central figure is Elisabeth Nietzsche, sister of Friedrich. If the philosopher's role in anticipating Nazism is ambiguous, there is no doubt about hers. With her husband, she established the "racially pure" colony of Neuva Germania in 1886.

For her, Hitler was "wonderful, indeed phenomenal". Macintyre's report from the tattered remnants is startling, dark and absorbing.