Piper is one of the most reliable older SF writers, yet even the best have a few weak stories. This, in my opinion, is one of his. Clunky, gimmicky, lacking in genuine excitement—it's a sort of detective/spy tale that I could barely finish, short though it is.
Everyone (almost) is moving to Mars, so whom shall we leave behind?
Has some merit but written especially for the bleeding-heart liberal type, and dishonestly so.
Perfect story for vegan pacifists but less suitable for war-mongering right wing extremists like me.
A better story of the type that Astounding and others once used to fill the gaps between more popular novels and serials. Has some interest but mainly a gimmicky short.