THE WALLS HAVE EARS: The Greatest Intelligence Operation of World War II

At the outbreak of WWII, MI6 spymaster Thomas Kendrick began work on a top-secret operation: bugging the cell rooms of German prisoners in the Tower of London. This is the story of how this eavesdropping mission proved so effective that it would go on to be set up at three further sites, helping the Allies gain access to some of Hitler's most closely guarded secrets. 16 pages of photos.