In a futuristic society, stressed by over-population and climate change, news arrives of an astonishing discovery. Something has been found which people on Earth never expected to see again. A family desperately want to see it. The nature of their society means they face all sorts of obstacles. In the process, we find out the sorts of conditions under which everyone has to live. When the family finally reach The Discovery, they find they have come at a moving and momentous time.