Now, I’m no Led Zeppelin expert, but I read that song as describing some significantly transformative events. I’m pretty sure the lady in question is making bad, materialistic choices. And I think we have a few Tolkien references. Seems like that ought to be enough to work with.
Ladies and gentlemen, start your engines.
I’d use Trinity for this one. It’d be an ISRA-centered game; they’re the mystically oriented clairvoyant psionic order. I’m not sure I’d want the PCs to be ISRAns. Maybe members of other orders on detached duty? Something like that.
The core question would have to be how to resolve the conflict between the Sufi ideals of ISRA and the hard technological bent of the rest of the Trinity universe. Is there time for mysticism while Rome is burning? Is it safe to ignore ISRA’s vague warnings?
The stairway to heaven is a reference to the teleporters: Upeo wa Macho (and their leader, Bolade Atwan), who have fled from Earth as a result of lots of events which are summarized here. The ISRA proxy (leader), Otha Herzog, is the only person left on Earth who Atwan trusts. Building a materialistic bridge to lure the teleporters back won’t work. Herzog is the key to bringing Upeo wa Macho back to Earth and reuniting the remaining psionic orders.