He had been back on Earth for four days when the contact notification arrived.
It came through the constellation contact system the way the Maker had said it would — not a message, not a coordinate, just a presence in the Tower's ambient interface that resolved into a location when he held his attention on it long enough to read it. A floor number and a dimensional anchor point, the specific address format that high-floor constellation workspaces used, the kind of location that didn't appear in the Tower's public registry because it wasn't a floor the Tower had built. It was a floor someone had built inside the Tower, which was a different category of thing entirely.
He stood in his apartment and looked at the notification for a moment.
Then he went to the subspace.
