RAF officer Jack Collins arrives at Colditz and does not endear himself to his fellow inmates. He is a con artist and a card sharp, who fleeces the gullible Brent. However he is more interested in playing cards with Kruger, a German guard, who ends up in his debt. In addition to getting Kruger to supply metal I.D. tags for the castle’s civilian workers, Collins intends his own independent escape plan, making use of his knowledge of Germany when he was a pre-war businessman and looking to his Jewish clients to help him out of fear of discovery.