This powerful docu-drama tells the story of one of World War Two's last secrets - an audacious British intelligence operation to listen in on the private conversations of 10,000 German POWs without their ever knowing they were being overheard. Now dramatized - word for word from the original transcripts - the film tells how this vast operation captured not only vital military intelligence but kept secret shocking accounts of war crimes - letting the guilty walk free. (Written by Christopher Spencer)