Based on a French lieutenant's account of his 1942 escape from a gestapo fortress in Lyon, this stately yet uncommonly gripping 1956 feature is my choice as the greatest achievement of Robert Bresson, one of the cinema's foremost artists. (It's rivaled only by his more corrosive and metaphysical 1970 film Au hasard Balthazar, playing next week.) The best of all prison-escape movies, it reconstructs the very notion of freedom through offscreen sounds and defines salvation in terms of painstakingly patient and meticulous effort. Bresson himself spent part of the war in an internment camp and subsequently lived through the German occupation of France, experiences that inform his magisterial grasp of what the concentrated use of sound and image can reveal about souls in hiding. Essential viewing. In French with subtitles. 101 min. Music Box.