A very interesting book and history bestseller, Montaillou: Cathars and Catholics in a French village, 1294-1324, was written by famous historian Emmanuel Le Roy Ladurie from the interrogation proceedings. I don't remember any torture being mentioned. But the wealth of information that could be found shows an intense will to understand what happened in the village - and allowed Le Roy Ladurie to pretty much build a sociology of the community. I'm not sure American interrogators are close to being able and interested in actually understanding what happens to those they question.

Un roi sans divertissement est un homme plein de misères