Emmanuel Le Roy Ladurie, Montaillou: The Promised Land of Error (I read the German version where the title is: "Montaillou. A village before the inquisitor". The French original just has "Montaillou, village occitan")

It's an analysis of very thorough inquisition protocols written in the early 14th century about the inhabitants of the south-eastern French village Montaillou, in which Catharism was still widespread. You get an astounding insight into daily life like family relationships, work routines, sexual and (im)moral practise, life of apparently freedom-loving shepherds etc. etc. Basically the only cliché about the rough and dark middle ages that is missing is the brutal and merciless inquisition (only a small number of questioned Catharists got sentenced to death or jail). But after all, they wrote the records.* If someone is into this kind of microhistory or historical anthropology of the medieval era, I can highly recommend this book which almost reads like a novel. Plus, it'd make a good basis for a TV show à la GoT, just without the constantly dying main characters...and less swords, of course. I can't help the thought of using this material for a Thief FM with Hammerites and Pagans....

*Still, when browsing Wikipedia, I found an article by the foremost German left-wing sort-of-intellectual magazine, Der Spiegel, (mis)using the results to exactly reproduce the clichéd image of said inquisition. I don't know what I expected...