I had somewhat of a idea while back.
Something like a detective/hunt game.
Lets say,
A "package" has to go from point A to point B. Not a short distance trough. Something like 10 or more systems.
Now this package has to be something not very common, like a gun, armor or a cargo hold of goods. Prehaps 10 units of X, 10 unit of Y and 10 units of Z.
The package will have to get to it's destination, while transfering couriers(players). Like every few systems the package changes hands.
Now we come to the core of things. A group or players, bounty hunters, detectives, whatever, have to get a hold of the package. They will have the possible name of the 1st courier and no more info.
So how are they going to find the package? Either by interogating a courier or asking the locals (if they have seen the package).
It's still a rough idea and I think I'll need more thinking, but I'd like to see a even like that.