Speaking of those 9 masks, I found a wooden mask that looks like them. If you put it on you're teleported to this alter where you can place the 9 masks. I've only found 2 of them though so I have no idea what you get for finding them all.
Oh, and I was recently attacked by hired thugs for stealing something from someone. Strange thing is, I stole the stuff AFTER he was dead. What, did his ghost write out that contract?