I played through this as far as I could get and... wow. This is a thick and involved mystery with a colorful cast of characters. At first it was kinda tough getting used to the all-text format and trying to get to know everybody, but soon enough after taking enough notes things started to come together a bit. However, I never did figure out who did it. I still have no idea who took the ring and I got a game over from too many wrong answers and forgot to safety save anywhere in my first run. I think the only error I ran into was a minor html error on the "he was lying about the ring getting stolen" accusation.
I enjoyed this and I looks forward to someone more skilled than myself getting to the ending! ^^;