Ms. Terwilliger's Ring

I give this 4 starts for the story, well narrated, dry enough not to be overwhelming, precise in its description. 2 stars for interactivity instead: it doesn't feel much of a game (bar from a choice towards the end) and much more of a (very) short story.

Since it is not long at all I recommend you to play it, as the author managed to convey the horror quite nicely.