This is likely my top pick among Robert Bresson’s films; it recounts the experiences of "Fontaine" (François Leterrier). He’s been taken into custody by Nazi authorities accused of espionage and acts of sabotage, and he's held without a formal hearing. His situation looks bleak, but he resolves to resist being broken down by his captors’ threats and pressure. During one night in his confinement, he notices the cell door that contains him is constructed from oak along with other, more pliable materials—could he discover an opportunity to break free before facing execution? The deliberate rhythm of the story is what truly makes it work well. Leterrier delivers a remarkable performance, drawing the viewer into his daily dangers and uncertainty about whether he'll make it through each day. He’s among other prisoners whose reliability can’t be taken for granted. When an unanticipated cellmate is assigned to him, his alternatives narrow considerably—and until the very end, we remain unsure of how things will conclude. Mozart probably never envisioned that his "Kyrie" and "Agnus Dei" pieces would ever be employed in such a disturbing manner, and the entire movie conveys a sense of danger and genuineness from its opening moments. If you have the opportunity to watch it in a theater, I strongly suggest you do so—it runs for just 100 minutes, but they are gripping and absorbing.

Source on TMDB