As someone who's a fan of a certain folktale and tabletop roleplaying game riffing off of it, this was a lovely and creepy take on the story of (Spoiler - click to show)Bluebeard.
The letter-writing mechanic is simple but clever, and the writing itself holds together in a subtly creepy fashion. You are primed to the idea that this is one person trying to write and rewrite these letters to her sister-- that feeling contributes to the obsession and distress present in the story.
I do feel like more build-up could've been present regarding the attic, but it was a 4 hour game so, as-is, it works.