I think I got something on the riddle.Thalia's description/ semi-solution lead me to believe that the riddle is referring to 1) Brian's killer, 2) Sinwa Terrence, and 3) our dear Ms. Daniels. Maybe Daniels is some sort of an undercover cop, and was trying to catch the killer with Terrence as bait. Although, this is farfetched... Also, with Cavenglok's hint, I think that it might have something to do with the fact that the hotel is old.
EDIT: Why would you have a party when there's been a murder there...?
EDIT2: Oh, crap. we should interrogate Steam again and have a "talk" with James Cross, the one who saw the body. Completely forgot about them...