Spied upon by MI19 in a bugging operation of unprecedented scale and cunning, 4,000 German POW's revealed their inner thoughts about the Third Reich and let slip military secrets that helped the Allies win WWII. Based on groundbreaking research conducted by a team of leading German historians and scientists, the film will tell the story of how those confessions were stolen, how they changed the outcome of the war and how they can now reveal, in more shocking detail than ever before, the hearts and minds of the German fighter. The evidence that supports this extraordinary new chapter in the history of WWII will be told through powerful dramatic reconstructions. Acted by German actors, speaking both German and English, they will quote directly from the highlights of over 100,000 hours of secretly recorded and therefore unguarded conversations between German POWs held in Britain. These long lost voices of the past are being brought back to life, bringing with them unique and exclusive insights into What the Nazis Really Thought.