I recently found out that Sierra's "Colonel's Bequest" is now "Abandonware" dating all the way back to 1989...
Anyways the game was a mystery trying to figure out who is the murderer. The game is like a Play and is divided into "scenes"/"acts".
What's so cool about the game is there are a bunch of places you can visit - which require you finding a way to "get into them". Added to this is the bonus that being in the right place at the right time can result in you spying or seeing someone do something out of the ordinary (like walk into the barn, etc.)
This uses Sierra's old technology - but it's still rather an amazing MYSTERY.
As Abandonware - it's really amazing that you can download and play this amazing game - even by today's standards. There has really never been anything like this game (in modern gaming) - at least I have never seen anything comparable.
I remember having the game - but never being able to "finish" it knowing who the murderer was or what happened to the Colonel.
You can get a copy of the Fingerprints required by the security verification. You can also download the game too... In case you want to do things like SAVE a game, LOAD a game, etc.
But it was/is a cool game! There are a bunch of good Sierra games: Space Quest Series, Police Quest Series, Hero's Quest, King's Quest, etc.
All great "Adventure Games"...