Look at the typewriter and read the paper that’s in it. Look on top of the wardrobe to find an ancient map with a red cross on it.
In front of you is a tape recorder. Use the tapes in front of it several times to learn more about what was going on. When you’ve reached the last one, you can understand that Coombs was onto something. And then: look at the mirror! When the image fades, the phone rings. Pick up the blue phone next to the tape recorder. You listen but… no one speaks…
Game source: A copy of the game was found here on the internet.