Oh, Jason McKittrick, how well you know my weaknesses. A narrative mystery told through prop documents? I don't know where you're going with it, but I like where it starts.
Ever since I discovered the awesome Dennis Wheatley mysteries I've been wondering why no one seemed to be doing a modern take on that prop-driven narrative approach. A few alternate reality games have come close, but they almost invariably dissolve into a morass of puzzle-wankery that makes no logical sense.