Did Germany's last Kaiser and Crown Prince help Hitler into power? That is a fascinating historical question with very real legal consequences in the present. Unearthing an enormous amount of new sources, the historian Stephan Malinowski took a fresh look at the situation and came to a conclusion that brought him into conflict with the Hohenzollern family. I sat down to discuss his new book The Hohenzollerns and the Nazis with him, which will be in British bookshops from 30 January.

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