Adrift on the Sea of Rains

A nuclear war has killed everyone on Earth, leaving stranded on the Moon nine astronauts at Falcon Base. With them they have a “torsion field generator”, a mysterious device which they hope will find them an alternate Earth which has not succumbed to nuclear armageddon. But once they’ve found such an Earth, how will they make the trip home? They have one Lunar Module, and that can only carry four astronauts to lunar orbit…