The game rules are quite simple. The plot moves along in chapters, which I will set out and serve as the opposition. I could go into more detail, but it would be easier to give an example. For the opening chapter I'll need more detailsof your characters too, so that I can work around it. You can kill any NPCs except those I say you can't (mostly commanders)

CHAPTER I- Ghosts of the General Staff

Location-Berlin, Germany. Federal Records building

Opposition-Talon Corp, German Politzei (possibly)

Records have been recently discovered that contain locations of one of the SS science division's facilities. Make your way to the records vault, located in the basement of the records building, and find the location. The building is not open to the public so if you're not invited, you'll have to be creative.

Enemies are armed with light weapons (nightsticks, pistols) and are wearing light armour.

It would be more detailed once I know more about your characters.