Historian Andrew Roberts calls this week's guest Kenneth Rendell the "manuscript whisperer." Rendell's new book is about his travelling the world during his career buying and selling significant historical letters and documents, from the Renaissance to the present day. The title of his book is "Safeguarding History: Trailblazing Adventures Inside the Worlds of Collecting and Forging History." One of the stories he tells is about his role in determining whether the Hitler diaries, published in 1983, were real or fake.    

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