An envelope that held a letter from Janina Iwanska to her father. The hidden message: “Five female Polish political inmates have escaped. We are preparing a new escape.” Polish Research Institute, Lund

The Brilliant Code Used by Concentration Camp Inmates to Tell the World About Nazi Experiments

'As a sign that you have read this, send me a blue thread in a parcel': The heroic tale of young Ravensbrück inmates whose coded messages to their families were no less than genius

The 27 letters were hidden for decades. Stuffed into furniture in the home of Krystyna Czyz, they were found by her daughter only in 2010. All were written by Czyz and sent to her parents from the Ravensbr ck...

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