A constellation of persons or events will have precedent. It will not appear out of nothing; it's a converging of previous trails and persons. Before one set of adventures, there was always another set; and before those, still another set, back to the beginning of the world.
We pass from one set to another now, from the Green-Flame adventure to the Half-Sky adventure. We are still in the middle of the nineteenth century, that most unreal of centuries, looking for reality under stodgy and ridiculous surface.