Clue (1985)
Clue finds six colorful dinner guests gathered at the mansion of their host, Mr. Boddy -- who turns up dead after his secret is exposed: He was blackmailing all of them. With the killer among them, the guests and Boddy's chatty butler must suss out the culprit before the body count rises. blackmail, butler, board game, mansion, whodunit, maid, old house, one by one, secret passageway, murder mystery, murder weapon, dinner guest, witty