
Antony, in the genre(s) science fiction
The Crystal Crypt is a science fiction short story by Philip K Dick and was first published in the US magazine Planet Stories, January 1952.
The Crystal Crypt tells the story of the very last Mars to Earth space flight, an mass evacuation that took place after hostilities broke out on the Red planet. Of course the last ship isn't going to leave easily, not when the black-clad Leiters are on the prowl.
A great little Philip K Dick short story, and one that has a genuine surprise plot twist and a great ending.
The surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.