One of those Ace books with one story reading one way and the second story reading the other way. "Cache from Outer Space" is a novel described on the cover as "The secret of civilization was buried in that spaceship". "The Celestial Blueprint" is four short stories: "Rastignac the Devil", "The Celestial Blueprint", "They Twinkled Like Jewels" & "Totem and Taboo", described on the cover as "They challenged the standards of many worlds".
