We have decided to make mystery and being watched a main part of our game.

Ok so far we are looking into making the players feel as though they are being watched every where they go, sort of like Orson Welle's book '1984', where everyone is being watched by Big Brother 24/7.
That would keep the players on high alert about each action and move they make.
But we can't figure out exactly what we want the target to be =S