Ryan was a billionaire in the (insert age of AAMFP), who had lots of factories and resources at his hand. If he wanted anything, he would have it at the moment. He lived in a house in a little town, with his wife, Lucy.
Lucy and Ryan worked in their own factory, Ryan as a chief and Lucy as a normal worker (Lucy wanted it this way). One day, Lucy had an accident and she got basically cut to pieces by a machine. Ryan thought it had been his fault that she died, and he got depressed and began to isolate himself.
After 4 years, Ryan has disappeared, and it's up to Mark (or any name), a police officer, to discover where he is. Also, it's up to him to discover the reason behind the recent faint earthquakes.
Mark goes to Ryan house, just to see it's all messed up and there is no sign of life, only disorder and dust.
While in the house, Mark discovers that, apparently, Ryan has an underground city in an abandoned mine that went down his house. After solving a puzzle, Mark reaches the city.
[MAIN IDEA]
This story would be to find Ryan, as you guess, but it would have something pretty unique: the environment wouldn't be a cave or anything like that, it would be a TRUE city underground. As a city, there are people, but not normal people. They are "Ryan's sons":
http://i.imgur.com/ojFY22a.png
(something similar to this:
https://encrypted-tbn1.gstatic.com/image...WDdV4YH_rQ)
(I still need to texture them and to animate them, which is something I will do if someone volunteers to do this)
The thing is, Ryan is the mayor of the city, and as it, he is in the most deep zone, way more meters down. The elevators that go to him are turned off, and it's your mission to turn them on so you can find Ryan. (The door back to the surface gets locked by a mechanism, so you can't get anyone to help you)
The Ryan's sons are violent, but not by choice. Ryan puts a gas that angers people, in a way that they can't think, they can only serve. The place were the gas is stored can be seen in the image of my model, in their backs.
Ryan, in his spike of madness, has decided to destroy the world of the machines, which is to say, all occidental society. To do that, though, he needed the machines anyway. He thinks that the fault of her wife dying and more other people are fault of machines, not the people that use them.
The cool part of this story comes in the concept that, while you need to find Ryan and complete your objective, you travel around a city underground, which I've been designing. A city with a circular design, like this:
http://i.imgur.com/96BLV8G.png (please I know there is just one text but it bugged and only allowed me to put that I apologise for the inconvenience)
All the city style would be steampunkish, kind of a giant factory with houses and gardens, and, while you find a way to turn on the elevators, you would have to cross a city where everything is hostile to you.
Once you find, Ryan, you should be able to:
-Agree with his plan and leave, and say you haven't found him
-Disagree with him and destroy the city (there's a way it can be done)
-Try to convince him that his plan is madness