A collection of short science fiction by Robert Heinlein from 1947 through 1957. None of it is included in The Past Through Tomorrow Future History thing, so it's worth having.
The blurb on the back of my paperback (from the 1970s) says, in large print, all caps,
MOON CITIES PLUNGE UNDERGROUND!
...and goes ominously on about Earth being "a sinister planet dying in the sky" or some such nonsense. In fact, the title story is set in an underground city "on" the moon, and the characters are mostly high school kids. The "menace" is a beautiful female tourist who visits and nearly lures away the narrator's boyfriend. That's the conflict. But that's much less exciting! So much for blurbs.