Vespers

I still think about Vespers nearly a year and a half after first playing through it. In the game you are a monk in charge of a monastery during the plague years of Europe. The nearby town has succumbed to disease, and the abbey is the last available refuge. The game takes place over a few days as the plague begins to infiltrate this remaining sanctuary. Dark secrets are uncovered, and the abbey itself is one of the strongest and most dynamic characters in the game. Though not for the faint of heart, or those who are easily offended by violence or religious questioning, the sense of place, immersive character, and interesting NPCs make this one of my favorite IF works.