This Last Room is the kind of thing that would be popular today with Evangelical Christian audiences. It is the American Christian drama.
The setting is a Communist country where religion is outlawed. David Niven plays the inquisitor. His victim is Anton the village schoolmaster, found with a copy of the Bible.
Before the torture begins. Niven explains the process, how Anton will withdraw to a room in his mind as the pain is inflicted. Each room will get smaller and smaller until he enters the last room.
Then there is no way to go and Anton will talk. All Niven wants is two names.
Away from his work, Niven is a friendly sort. He has struck a friendship with Ilsa a young woman who is mute. A neighbour snooped in her flat and found a Bible. An indiscretion that Niven ignores.
As the days go by, Anton withstands all the torture. He is dying but he will not talk.
Niven tells Ilsa all about Anton and she eventually gives him an answer. Something that changes the interrogators live.
The story has all the Evangelical beats. The irony being that it would had been partially inspired by McCarthyism.
The Niven character was parodied by Michael Palin in Brazil. The friendly ineffectual guy who really was the chief torturer.