chunk: Renfry attempts to understand the autopilot and to rewind the course “tape” while the three time agents explore the jungle-draped ruins of a once-great city, in which they’ve landed. After several weeks Renfry believes that he has succeeded and he attempts to launch the ship. The ship runs its course in reverse, pausing on the desert planet and the refueling station, and brings the four men back to Earth, landing on the very spot from which they had blasted off.