A lesser work by the great John Wyndham. It returns to an odd golden age pulp vibe, which Wyndham had shaken off in most of his stellar post-WW2 career.

But "The Outward Urge" still has much to recommend it, including the imagined future world order after the global north is wiped out by war. You have to be ready for the quaintness of a book set in a future which we now know has completely failed to happen.

I had to add the cover from the Penguin edition, I loved seeing these in the school library in the 1970s.