Chatwin Manor is a graphical whodunnit game along the lines of the boardgame, Clue. It consist of multiple graphics screens that are loaded as needed (like the room map), and an ML routine to draw the text much faster than BASIC can. In it you have to figure out clues enough to solve who did the crime, similar to Club. Unfortunately, there is a constant sound while waiting for keyboard input that can get annoying after awhile, but otherwise it's a pretty solid version of the boardgame.
Title: Chatwin Manor
Author: Bob Horne
Publisher: Goldsoft/Coco Oz
Released: June 1986
Requires: Color Computer 1/2/3, 32K RAM, disk only.