What if a corporation hires a surveyor to survey an asteroid field because the corporation wants to clear a path through them (again – science?) to build a bypass (“You’ve gotta build bypasses”). The surveyor finds the ruins of a previous civilization spread across the asteroids, as if a world had broken up, the atmosphere sucked out into the void, leaving just the pieces of planet and whatever structures were built on them. The mystery, in this case, would be what civilization was this? How did the world turn into asteroids? Is there a bigger threat and what does that have to do with why the corporation wants a bypass?
There could still be a rivalry with another surveyor sent out to do the same thing by a different corporation or within the same corporation.
Maybe the people of the destroyed world now live on the interior of one of the big asteroids?
Maybe the asteroids are cursed/haunted?