I know it's weird of me to say....but the Butcher thing kind of reminds me of Dexter the TV show on showtime.
In the first season, there was the "Ice Truck Killer," who killed his victims in a cold refrigerated area to slow blood flow, drained all the blood and then cut them up into pieces very precisely while the cold kept the bodies fresh. I know it's probably not going to be at HHN, but it is a wicked premise to do a house on.