Dead author summoned 100,000 years ahead
The narrator, F.W., who died in the twentieth century, is called up as a revenant by an old friend reborn in a far-future 'astromental' civilization and is shown its wonders as an honored but primitive guest. He finds a people who live underground, travel by moving the destination toward themselves, and have ended weather and scarcity. Werfel wrote the book while dying of heart disease in California in 1945, so the narrator's tour doubles as his own rehearsal for death.
