Operation Nordpol
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Operation Nordpol, also called Das Englandspiel, was an enormous deception operation by the German Abwehr in World War Two. German forces captured Allied resistance agents operating in the Netherlands, and used the agents' codes to fool the Allies into continuing to provide the agents with information and supplies. About 50 Allied agents were executed. Between Silk and Cyanide by Leo Marks describes some of the British efforts to detect the ruse, which ran for quite a long time.
- Giskes, H.J., London Calling North Pole, written by the German spy chief who ran the operation.