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Under a pile of old clothes, in the barracks of the most notorious of all of Hitler's concentration camps, Dr Eddy de Wind hid a notebook with an account of his life as a prisoner in Auschwitz.
75 years since the liberation of that death camp, the only memoir written from inside the camp has been published. It's called Last Stop Auschwitz: My Story of Survival From Within the Camp.
We'll talk to Eddy de Wind's son Melcher about the book his father risked his life to write to bear witness to what happened there.