The Nazis, exasperated at the number of escapes from their prison camps by a relatively small number of Allied prisoners, relocate them to a high-security 'escape-proof' camp to sit out the remainder of the war. Undaunted, the prisoners plan one of the most ambitious escape attempts of World War II. Based on a true story.

Ray Breslin is the world's foremost authority on structural security. After analyzing every high security prison and learning a vast array of survival skills so he can design escape-proof prisons, his skills are put to the test. He's framed and incarcerated in a master prison he designed himself. He needs to escape and find the person who put him behind bars.

1956 French film by Robert Bresson