A classic set up that will be familiar to lots of readers of people who've seen SF movies: an Antarctic base, the landing of a ship, the presence of aliens. Except they aren't aliens. They're human children. Where did they come from? That's just one of the mysteries in this novel. [Spoiler: It turns out that the title's misleading.]
Murray Leinster was real pro. He works in scientific problems and solutions, political commentary and commentary on the media (both almost as accurate now as they were when this book was published 40 years ago), a love story, a poignant story of loss and separation, and some other stuff as well. The story moves along in Leinster's serviceable prose (maybe a little adverb heavy for today's readers, with things like "he said vexedly"), and it's great fun to see how all the problems get solved, or it is if you like old-fashioned SF, which I do. I hadn't read this in many, many years, and it was fun to visit it again.