The inhabitants of Roger Zelazny's Sign of the Unicorn are not human beings at all but a race of aristocrats who live in another dimension and who can slip in and out of Earth, which they call Shadow, when they feel like it. They are a squabbling crew of brothers and sisters, a sort of outsize Borgia family complete with daggers and swords and Renaissance castles, and the plot of the novel is closer to that of a thriller than to most science fiction plots. I mention the book, though, because it is good, because it solves the stylistic problem of science fiction in an interesting way, and because it represents a sort of boundary of science fiction, the place where it ends.
To take the last...
(The entire section is 540 words.)