1973’s More Things in Heaven is an expanded version of John Brunner’s The Astronauts Must Not Land.
David Drummond is astonished to see his brother Leon on the Calle Gagarin in Quito. Leon is on board humanity’s first faster-than-light starship, Starventure. As far as David knows, Starventure has not returned from Alpha Centauri. How then can Leon be in Quito?
As it happens, Starventure is back in the Solar System, orbiting near Jupiter. What follows raises more questions rather than answering them.