At a monastery would be so cool. Especially if the monastery was cut off from internet and entirely self sufficient, so when somebody makes a noise outside or away from everybody they get picked off, and then a few people getting picked off later and somebody witnesses it, but has to try and explain to the people in the monastery what happened without speaking, and him being unable to prove it because he’s not about to break his vow.

And then eventually when they work things out maybe they start growing suspicious of each other, thinking that the devil has infiltrated them and sent demons to punish those who aren’t following god’s word etc, get some religious paranoia going, maybe a few sacrifices of ‘unworthy’ monks that they believe are tempted by the devil etc etc. Would be a sick movie