I wonder what it is about mansions and murder. I've written before (on VantageBoard, at least) about a mansion not far from where I grew up. My aunt lived nearby and knew someone there. We sometimes visited and my sister and I played on the grounds, including peering through wrought iron gates into an old cemetery. The interior has a lot of dark paneling, leaded glass, etc., and would make an authentic Collinwood. While we were still children, the heiress living there was murdered. I don't really want to say more because of maintaining privacy of families, although certain people here do know the specifics.