M room: secret listeners who bugged the Nazis.

This is the story of the German emigres who fled Hitler's regime and became secret listeners for British Intelligence during WWII. From the M Room they bugged the conversations of over 10,000 German PoWs, including 59 German Generals at Trent Park in North London. This story places firmly on record just how much British Intellengence knew about the Holocaust. Why, at the end of the war, were these files not released for the War crimes.