So said one of the two men who got into the train and settled down.The planet earth passes through the tail of a comet, and as the result of a massive collective shift of spiritual consciousness, human society is transformed into a polyamorous happy new state of affairs. It goes on for a bit longer than that, but that's the gist. Really rather earnest, even by Wells' standards. You can get it here.
This was my top unread book by H.G. Wells. I am hoping for better with the next, Kipps.