Wartime docu-drama starring John Mills, Eric Portman and Lionel Jeffries, re-telling the experiences of Allied prisoners-of-war who were held in Colditz Castle. These POWs were strictly monitored as they were a high risk category and had constantly tried to escape whichever prison they where previously placed in. Despite being outnumbered by their guards, the prisoners of Colditz continued to achieve their goal - freedom. The film inspired the 1972 TV series 'Colditz'.