The smallest error could prove fatal

1943, France is under Nazi occupation. The French Resistance fighters are locked in prisons. Oftentimes executed. Fontaine (François Leterrier) figures he can't remain incarcerated, so he must plan an extraordinary escape. Robert Presson's (who himself had been a prisoner of war during WWII) A Man Escaped (Un condamné à mort s’est échappé ou Le vent souffle où il veut) is a nail-biting classic. Based on a true story.