Vespers

As a hypochondriac, I stopped playing Vespers as soon as I read the word 'plague'. And then, a few days later, I started playing it again. Something about its atmospheric depiction of an abbey barricaded against the Black Death drew me back, not because it was pleasant, but because it was quite thoroughly sinister.

Another thing that quickly had me hooked me was the way Vespers starts out as a medieval detective story. Alongside the plague, murder has come to the abbey, not to mention a mysterious waif and stray, and the monks are all acting strangely - among them the player character. As things progress, Vespers only becomes darker and more sinister, something that I would normally expect to repel me - but this carefully constructed rendition of apocalyptic Dark Age sentiments kept me hooked until, naturally enough, the detective portion gives way to a set of uncomfortable decisions - some of which you will have already made before you realise their portent.

This kind of IF game, where you must explore a world and form a moral reaction, has obviously been done before, most notably in Slouching Towards Bedlam. But whereas in that game I found myself having to refer to the hints to get the least thing done, my experience with Vespers flowed quite nicely towards its dramatic and nihilistic conclusion.