The GESTAPO has determined that there is a spy in the camp, impersonating one of the downed airmen. They are able to work out that it's one of three recent arrivals, which includes Jim Caddon. The three men are brutally interrogated but none will admit to being the spy. Getting nowhere, the GESTAPO officer, Major Stahl, decides to execute prisoners until the man comes forward. This all leads to a very special mission for Jim Caddon.