MASQUERADE™An illustrated adventure game(screenshots)

It turned out to be the toughest case of your detective career. Clues have led to nothing but dead ends. Nobody is talking. Meanwhile, the crime boss you are after is still operating from somewhere. You're about to throw in the towel. But wait! Something breaks. You trail a stooge of the crime organization to a cheap, seedy hotel, hoping to pump some answers out of him. You break into the hotel room and with the butt end of your trusty .44 magnum, you knock him cold. This could be the lead you've waited for. Maybe, just maybe, if you could find some clues .....

Source:

Back of Cardboard Folder - Apple II (US)